Answer :
-- I believe there's a typo in your question, and
you meant to type ' 41' instead of ' 51 '.
-- Here's how to arrange them:
-----------------------
| 43 | 36 | 41 |
-----------------------
| 38 | 40 | 42 |
-----------------------
| 39 | 44 | 37 |
-----------------------
The diagonals also add up to 120.
