Step 1:
The first step to converting 78451.16787535 to a fraction is to re-write 78451.16787535 in the form p/q where p and q are both positive integers. To start with, 78451.16787535 can be written as simply 78451.16787535/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 78451.16787535, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 78451.16787535/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 78451.16787535/1 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 78451.16787535 as a fraction:
392256/5 / 1