Another thing you can do is to post and accept your own answer which collates/quotes from each individual poster's partial answers. Something along the lines of
The correct answer is:
Foobar!
First, you do this, as ghosts_in_the_code figured out here
....
Then, you do this other thing, as Kate Gregory figured out here.
...
And so on. Then you mark it Community Wiki.
Doing it this way pulls all the relevant information into a single post, links to the appropriate steps wherever they came from (regardless of upvote order, which can change), and makes it clear that you're just acting as curator, not trying to undercut everyone else.
Also, in addition to upvoting, you can award a bounty to someone if you feel like they solved the majority of the puzzle, even if they failed to take the last step.