Porter is a painter who creates beautiful paintings of wild animals.  Most recently, he painted a mural of a pack of wolves standing on a snowy-white mountainside underneath a full moon.  He put the painting up for auction and it sold for $1000 less than five times more than he had made on his previous painting.  If he received $44,000 for the sale of his most recent painting, how much, in dollars, did he make for selling his previous painting?
Solve this problem.