It would help if you could mention what text you're using (I've asked you this a few times, but you haven't responded).
Generally, a sentence tableau is just the same as a truth tree - although a few texts treat sentence tableau much more modestly than a full-blown truth tree proof system. In any case, the notation for truth trees often varies from text to text. So, knowing the precise system would be useful in order to construct a tableau (i.e. tree) for your problem.
However, here is a truth tree. It may have a different format than what you're using. The lines aren't numbered below the argument. Note that when checking for validity using a truth tree, the negation of the conclusion is used in the tree. Also, you have "therefore" on line 2 and on line 4, but I'm instead assuming that you mean "if/then".