Step 1:
The first step to converting 3936.78978414 to a fraction is to re-write 3936.78978414 in the form p/q where p and q are both positive integers. To start with, 3936.78978414 can be written as simply 3936.78978414/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 3936.78978414, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 3936.78978414/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 3936.78978414/1 each by 100000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 3936.78978414 as a fraction:
74799/19 / 1