Step 1:
The first step to converting 77120.4087087 to a fraction is to re-write 77120.4087087 in the form p/q where p and q are both positive integers. To start with, 77120.4087087 can be written as simply 77120.4087087/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 77120.4087087, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 77120.4087087/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 77120.4087087/1 each by 10000000:
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 77120.4087087 as a fraction:
385602/5 / 1