Step 1:
The first step to converting 664672.35478791 to a fraction is to re-write 664672.35478791 in the form p/q where p and q are both positive integers. To start with, 664672.35478791 can be written as simply 664672.35478791/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 664672.35478791, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 664672.35478791/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 664672.35478791/1 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 664672.35478791 as a fraction:
664672/1 / 1