Taking a closer look at it now I have found that the two floor joists that would rest on the part of the beam that is missing have a built box using hangers that connects them to joists that are resting on the original beam. I was able to talk with a contractor that looked at it and said that both sides sag to the center 2 foot by 2 foot column roughly an inch each. He suggested to put a beam in the gap section made up of 2 x 6's and supported by a permanent adjustable steel column. Also, he suggested placing a the same type of steel column next to the one that is already there and also on the other side of the 2 foot by 2 foot column. He said that if we can deal with the minor floor difference that we would not need to jack up the beam. What are everyones ideas on this?