1. The problem statement, all variables and given/known data How am i going to compute for the 3rd force? the given are 163g 54degress S of E, 401g 12degrees E of N and the resultant 915g 180degrees or West. 3. The attempt at a solution I computed it like the way a resultant is missing. I got 780.52g at 19.48degrees N of W. They say it is wrong. They say it should be computed differently.