The calculator on this website will tell you much more quickly than I can!
But if you'd like to learn how to do it, then here it goes:
When dividing a fraction, you are actually multiplying by the reciprocal. (A reciprocal is a "flipped" fraction, example, reciprocal of 44/90 is 90/44)
Instead of 3/4 ÷ 4/5, you would be doing 3/4 * 5/4.
When multiplying fractions, multiply the top numbers together and multiply the bottom numbers together.
3/4 * 5/4 = 15/16, or 0.9375
Hope this helps!