Step 1:
The first step to converting 77896.21126791 to a fraction is to re-write 77896.21126791 in the form p/q where p and q are both positive integers. To start with, 77896.21126791 can be written as simply 77896.21126791/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 77896.21126791, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 77896.21126791/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 77896.21126791/1 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 77896.21126791 as a fraction:
311585/4 / 1