Step 1:
The first step to converting 77321.78799779 to a fraction is to re-write 77321.78799779 in the form p/q where p and q are both positive integers. To start with, 77321.78799779 can be written as simply 77321.78799779/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 77321.78799779, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 77321.78799779/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 77321.78799779/1 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 77321.78799779 as a fraction:
309287/4 / 1