Free Body Diagram: determine the vertical reaction at the left hand beam support.

Given specific magnitudes of P1 = 539 N, P2 = 431 N, l1 = 3 m , l2 = 4 m, l3 = 4 m determine the vertical reaction at the left hand beam support. Give your answer, with the correct sign, rounded to the nearest whole Newton. When entering a positive number just give the number without the plus sign. Include the minus sign for negative numbers.Include the correct units.
I know this isn't exactly maths and sorry about that, but I tried doing this and got 1374N when the answer is 512N
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let me know if the bounty should be increased.
Answering this question carefully may easily take an hour. The offered bounty is definitely low.
this was in a quiz with a half hour time limit, but I've increased it. Any insight would be appreciated
Low bounty!