enable, unable

Enable or enable means to give power, ability or means to--
This grant will enable him to finish college without working full time.
The medication may enable him to function normally.

Unable or unable means lacking the necessary competence or power--
He is old, and unable to fend for himself.
"Miss Otis regrets she's unable to lunch today."

Now that you know that, you can say--
"Our firm is unable to advance you enough money to enable you to go on with your project."