Getting lost in my math

3. A force P is applied to the bracket, as shown to the right. Knowing that the allowable stress in section ABD of the bracket is 10 ksi, determine the largest force P that can be applied. (Hint: see side View below; this is actually just a 2D problem. The 3D picture shows the dimensions of the cross sectional area.) Ans: P = 865 lb. 0.8in , 1.5 m 0.5 in