Costco Wholesale Corp.'s (COST) fiscal fourth-quarter earnings fell 6% as it continued to suffer from weak sales, higher employee benefit costs and lower foreign earnings due to the strength of the dollar, although it reported higher sales in recent weeks.

The warehouse retailer, which sells items in bulk to its paid members, has battled a consumer-spending cutback in a weakened economy that has led to the company missing analysts' earnings expectations in each of the first three quarters of the fiscal year.

Meanwhile, smaller rival BJ's Wholesale Corp. (BJ) has outperformed Costco in terms of sales this year as consumers increasingly flock to discounters.

For the quarter ended Aug. 30, the company posted a profit of $374 million, or $0.85 a share, down from $398 million, or $0.90 a share, a year earlier. Revenue fell 3.1% to $22.38 billion.

Analysts surveyed by Thomson Reuters had projected earnings of 77 cents and revenue of $22.34 billion.

Sales in the period fell 3% to $21.9 billion, with same-store sales excluding currency changes and gasoline sales rising 1%. It fell 1% in the U.S.

However, the company said that for the five weeks ended Oct. 4, net sales were $6.85 billion, a 3% increase on the prior year period. Same-store sales excluding currency changes and gasoline sales rose 4%, including a 3% increase in the U.S..

Costco shares closed Tuesday at $57.93.

-By Nathan Becker and Steve McGrath, Dow Jones Newswires; 212-416-2855; nathan.becker@dowjones.com