This should be a fairly easy multi, the toughest part will probably be the math, so bring your pencil and paper or a calculator.
You will use the information at stage 1 to obtain the final coordinates.
The final is located at N 44 10.aaa W 092 10.bbb
aaa = Post number minus 4181
bbb = year erected minus 1560
Container has a log book, and has room for small tradables and trackables.
Good luck, and happy caching!