Your businessman associate has another trouble shooting job for you. This time, you have to renegotiate a deal that's in danger of falling apart. It seems an unknown third party is trying to sabotage the talks, but that is a problem for another day. For now, you need to talk to each of the businessmen involved and try to salvage the agreement.
This mission has you run around to various ports and talk to some NPCs. There are multiple outcomes, based on which conversation options you choose. (Your mentor has advise if you ask for more guidance). Among the possibilities are that the shipwright may agree to offer the farmer the same deal on tools, he may cut split the deal between the other two contacts so that the one who lost half the deal demands monetary compensation, or the deal may be unchanged, and the farmer who was left out requires monetary compensation. This doesn't seem to have any effect beyond changing the flavor text.
After negotiations, three level 15 Dutch thugs are waiting for you when you board your ship. That means you have to click on the Coxswain in the port where the shipwright is to continue.
Return to the lumberman and the plantation owner to inform them how the deal works out, then finally return to your mentor.