How to support this deck post?

[Riley Holt]

So I’m working on fixing up this rental that I recently acquired. The front porch is leaning because one of the supports is shifted. It is a pier and beam house with two supports on a cement porch and the third post is on a leaning pored cement block approximately 12”x12”. I want to square this up and either use a deck block or put a form around the existing block to level it out. The problem is I can’t for the life of me decide how I would do it. Suggestions?

Ps: I don’t know how to upload a picture.