Step 1:
The first step to converting 78219.789718015 to a fraction is to re-write 78219.789718015 in the form p/q where p and q are both positive integers. To start with, 78219.789718015 can be written as simply 78219.789718015/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 78219.789718015, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 78219.789718015/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 78219.789718015/1 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 78219.789718015 as a fraction:
312879/4 / 1