There's a worker poling a boat. He pushes parallel to the length of the light pole, exerting on the bottom of the lake a force of 240 N. Assume the pole lies in the vertical plane containing the boat's keel.

At one moment, the pole makes an angle of 35 degrees with the vertical and the water exerts a horizontal drag force of 47.5 N on the boat, opposite to its forward velocity magnitude 0.857 m/s. Total mass of the boat is 370 kg.

The water exerts a buoyant force vertically upward on the boat. Find the magnitude of this force.

I've been trying to find an equation to get started, but I have no idea.