Step 1:
The first step to converting 636859.978038 to a fraction is to re-write 636859.978038 in the form p/q where p and q are both positive integers. To start with, 636859.978038 can be written as simply 636859.978038/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 636859.978038, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 636859.978038/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 636859.978038/1 each by 1000000:
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 636859.978038 as a fraction:
636860/1 / 1