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2016-05-03T14:25:44+05:30

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Let us assume that the angles are with respect to the positive x direction.

The x component of the resultant force 
     Fx  = 300 * Cos 0⁰ + 400 * Cos 30⁰ + 400 Cos 150⁰
           = 300 + 200 √3 - 200 √3  = 300 N
 also    Fy = 300 * cos 90°  + 400 Sin 30°  + 400 Sin 30°
                = 400 N

F = √(Fx² + Fy²) = 500 N

The angle of the resultant with x axis is
       =  Tan⁻¹  Fy/Fx = Tan⁻¹  4/3 = 53.13⁰

2 4 2