1/4 divided by 3. Dividing by a number is the same as multiplying by its reciprocal.
So it's the same as 1/4 * 1/3. And when multiplying fractions you just multiply the numerator and denominator of each straight across.
(1*1)/(4*3) = 1/12
6.708 / 78. I would just type it into the calculator. You get 0.086