Wendy’s Arby’s Group Inc. (WEN), the third-largest fast food chain in the United States, posted a fourth-quarter loss of $393.2 million, or 84 cents a share, largely a result of impairment charges and falling sales at Arby’s, Reuters reported. In September, Arby’s owner, Triarc, bought Wendy’s International Inc. for about $2 billion in September to form Wendy’s/Arby’s.