During the quest connected with Pearl you have a chance to receive a letter from which you learn about Michael's location. He is one of the people with whom you must contact regarding stocks. You must travel again: this time you need a passenger carriage but also a cargo carriage because you must transport steel from the areas near Cincinnati.
If by any chance a destination city has some of this items you should buy as many as possible and place them in your warehouse. When you reach the destination it turns out that they don't want to sell it and you must get 24 packs of steel - luckily, you will be paid properly. Check the economic map and find where you can buy steel for a good price. If you haven't already made a newspaper subscription in neighbor cities then now it is a good moment to do it.
After delivering steel and brother to the target city you must go to the bank in New York. This time you don't have to take the brother with you. However, Michael owes about 5-10 thousand dollars to the bank. You must prepare yourself to spend a lot of money before you go there. When you pay the money you complete this quest.