Step 1:
The first step to converting 7981.987613649 to a fraction is to re-write 7981.987613649 in the form p/q where p and q are both positive integers. To start with, 7981.987613649 can be written as simply 7981.987613649/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 7981.987613649, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 7981.987613649/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 7981.987613649/1 each by 1000000000:
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 7981.987613649 as a fraction:
638559/80 / 1