I just used the quiltcalc app on my phone and it gave me these numbers:
Colour 1 - 2 3/8 yards
Colour 2 - 2 1/4 yards
Colour 3 - 5/8 yard
I'm not sure how precise it is as I haven't used it for a quilt of my own yet, but I hope it helps!
Oh, and the calculator assumed the width of fabric as 43 inches
:-)