Vectors in Space · Medium problem

Three forces act simultaneously on an object: $\mathbf F_1 = (2, 1, -1)$, $\mathbf F_2 = (0, 3, 2)$ and $\mathbf F_3 = (-1, -2, 4)$, each in newtons. The object moves along the straight displacement $\mathbf d = (3, 0, -1)$ metres. Find the total work done by the three forces combined.