Exxon Mobil Corp. [has] posted the largest annual profit [ever] by a U.S. company - $40.6 billion. Exxon Mobil also set a U.S. record for the biggest quarterly profit, posting net income of $11.7 billion for the final three months of 2007, besting its own mark of $10.71 billion in the fourth quarter of 2005. The previous record for annual profit was $39.5 billion, which Exxon Mobil reported for 2006. The eye-popping results weren't a surprise given record prices for a barrel of oil at the end of 2007. For much of the fourth quarter, they hovered around $90 a barrel, more than 50 percent higher than a year ago. Crude prices reached an all-time trading high of $100.09 on Jan. 3 but have fallen about 10 percent since. Also extraordinary was Exxon Mobil's revenue, which rose 30 percent in the fourth quarter to $116.6 billion from $90 billion a year ago. For the year, sales rose to $404.5 billion - the most ever for the Irving, Texas-based company - from the $377.64 billion it posted in 2006. Exxon Mobil produces about 3 percent of the world's oil.