What four, positive, dissimilar numbers have a sum that equals its product?

[swiftaw]

I still don't see how 1,1,2,4 is the answer if they are supposed to be dissimilar.

If you read, the OP initially got the question wrong, a repeat is allowed.

 

[orpheus1120]

http://links.jstor.org/sici?sici=0025-5572%28200003%292%3A84%3A499%3C91%3A8WTSET%3E2.0.CO%3B2-5&size=LARGE&origin=JSTOR-enlargePage