Step 1:
The first step to converting 78863.451858678 to a fraction is to re-write 78863.451858678 in the form p/q where p and q are both positive integers. To start with, 78863.451858678 can be written as simply 78863.451858678/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 78863.451858678, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 78863.451858678/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 78863.451858678/1 each by 1000000000:
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 78863.451858678 as a fraction:
157727/2 / 1