Looking on the internet deeply has found these results:

It is fine with me is the most popular phrase on the web.

It is fine for me 13,870,000 results on the web	It is fine with me 156,800,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
The floor is fine for me. However, it is fine for Your Highness to surrender. What you two just did there is fine for me. It is fine for Europe to focus at the moment on... I think it is fine for Nintendo That is becoming an ever greater factor when it comes to contentment and it creates ecological balance. That kind of attitude is fine for the rich.	And however you chooseto handle it, is fine with me. Okay, whatever you get for it is fine with me. Whatever you guys decide is fine with me. It is fine with me, Michael. If Mrs Gradin wants to release it or gives me permission to release it, that is absolutely fine with me and, as I said, she has indicated by an indirect route that she would be agreeable to that. Whatever it is that you come up with is fine with me. Just that... he is fine with your craziness.

It is fine for me

13,870,000 results on the web

It is fine with me

156,800,000 results on the web

More popular!

And however you chooseto handle it, is fine with me.
Okay, whatever you get for it is fine with me.
Whatever you guys decide is fine with me.
It is fine with me, Michael.
If Mrs Gradin wants to release it or gives me permission to release it, that is absolutely fine with me and, as I said, she has indicated by an indirect route that she would be agreeable to that.
Whatever it is that you come up with is fine with me.
Just that... he is fine with your craziness.