experimental chemistry - Uncertainty Equations Confusion

I am confused about the uncertainty equations calculations.

If I have the equation X1 * Y1 = X2 * Y2 and I want to find the uncertainty of X1 , I convert the equation to X1 = (X2 * Y2)/(Y1) . Now, I would know how to calculate the uncertainty if it was a straight division or multiplication uncertainty but this equation is both. How do I go about calculating the uncertainty if the equation contains both multiplication and division? Do I just do the multiplication uncertainty first and then the division uncertainty?

Thanks any advice is appreciated.