Step 1:
The first step to converting 77821173.713872 to a fraction is to re-write 77821173.713872 in the form p/q where p and q are both positive integers. To start with, 77821173.713872 can be written as simply 77821173.713872/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 77821173.713872, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 77821173.713872/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 77821173.713872/1 each by 1000000:
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 77821173.713872 as a fraction:
77821173/1 / 1