Here's a suggestion but consult an engineer. Measure the distance from the floor to the ceiling on both sides. So afterward you can check to see if there is any settling.
Depending on the span, get a steel I beam. The span and the weight above will determine the size of the I beam (6,8 inch etc.). Put a screw post jack on either end. Get 2 steel flat plates to put on the floor for the posts to sit on, get a size plate that's big enough to distribute the weight that will be put on each post, so the floor doesn't crack. Put the I beam right next to the post your taking down. Have the replacement I beam up snug to the ceiling. But not super tight. Take out the post. Then tap the I beam to the exact location that the original post was, a lttle at a time. Going from one post to the other. Then tighten the posts in position.
Once the I beam is in position and tightened, put a wood 2x4 on either side of the I beam on screw it to the ceiling so that you know the I beam won't move either way. Use what ever length 2 x 4 's you need to cross at least 3 joists. Cut an 8 foot 2x4 in half and that should cover 4 joists, if they are 16 inches on center.
Again this is just a suggestion, consult an engineer and a contractor. But this will give you ideas to ask them about.