FORBES: Magazine rankings leave 82 billionaires outside of the exclusive 400 club. By Jackie Farwell THE ASSOCIATED PRESS NEW YORK – A billion dollars just doesn’t go as far as it used to. But the list showed some notable changes. Joining the top 10 of the country’s richest for the first time were Google Inc. founders Sergey Brin and Larry Page, who tied for fifth place. The 34-year-old moguls’ wealth has quadrupled since 2004 to an estimated $18.5 billion this year, while their company’s stock value has surged 500 percent. And, lower down, almost half of the 45 newcomers made their millions in hedge funds and private equity investments. The youngest member of this year’s list was 33-year-old hedge fund manager John Arnold, who joined the ranks at No. 317 and a net worth of $1.5 billion. “Wall Street really led the charge this year,” said Matthew Miller, editor of the Forbes list. “God only knows if they’ll be on it next year. It really just depends on what the market does.” Surging oil prices also helped some members of the list. Oil baron brothers Charles and David Koch also broke into the top 10, sharing the No. 9 spot with estimated wealth of $17 billion. Their ascension bumped the Walton family, heirs to the Wal-Mart Stores Inc. fortune, from the top 10 for the first time since 1989. The discount retailer, struggling with a slowing economy, higher gasoline prices and merchandising mishaps, has seen its sales lag behind rivals like Target Corp.160Want local news?Sign up for the Localist and stay informed Something went wrong. Please try again.subscribeCongratulations! You’re all set! For the first time, it takes more than $1billion to earn a spot on Forbes magazine’s list of the 400 richest Americans. The minimum net worth for inclusion in this year’s rankings released Thursday was $1.3billion, up $300 million from last year. The new threshold meant 82 of America’s billionaires didn’t make the cut. Collectively, the people who made the rankings released Thursday are worth $1.54trillion, compared with $1.25 trillion last year. The very top of the list was unchanged: Microsoft Corp. founder Bill Gates led the list for the 14th straight year, this time with a net worth estimated at $59 billion. He was followed by Warren Buffett of Berkshire Hathaway Inc. in second place with an estimated $52 billion and casino mogul Sheldon Adelson, No. 3 with an estimated worth of $28 billion. Larry Ellison of Oracle Corp. maintained his ranking at No. 4, with an estimated net worth of $26 billion.