That'll come close. But the lift acts at ~25% MAC not just 1/4 chord (I know that's what you meant, G, but it could be confusing for some). If you have a W&B sheet that lists both MAC and FS, that'll be pretty easy to come up with. If not, you're going to need a scale drawing of the aircraft and some good geometry skills.
Just curious, what are you using this data for anyway?