Profit more than quadrupled in the third quarter for Amazon.com Inc. as shoppers worldwide bought more books, music, electronics and other goods than they did a year ago, the internet retailer reported Tuesday.

Earnings for the quarter ended Sept. 30 soared to $80 million, or 19 cents per share, up from $19 million, or five cents per share, during the same period last year. All figures are in U.S. dollars.

The results beat the average forecast of analysts polled by Thomson Financial, who expected earnings of 18 cents a share.

Revenue was $3.26 billion, up 41 per cent from $2.31 billion in the same quarter of 2006.

Amazon said sales on U.S. and Canadian sites were 42 per cent higher than a year ago, while international sales rose by 40 per cent.

The company has increased its revenue forecast for the fiscal year to between $14.26 billion and $14.61 billion, up from an earlier forecast of $13.8 billion to $14.3 billion.

The results were released after stock markets closed. In New York, shares of Amazon on Tuesday had risen $9.53, or more than 10 per cent, to $100.82.

With files from the Associated Press