To find the total number of candidates who took the driving test, we can use the fraction passing and the number passing.

Let's assume the total number of candidates who took the driving test is "x".

According to the given information, the fraction passing is 4/7 and the number passing is 56.

We can set up the equation:

(4/7) * x = 56

To solve for x, we can multiply both sides of the equation by 7/4:

x = (56 * 7) / 4

x = 98

Therefore, the total number of candidates who took the driving test is 98.