Step 1:
The first step to converting 687648.51334172 to a fraction is to re-write 687648.51334172 in the form p/q where p and q are both positive integers. To start with, 687648.51334172 can be written as simply 687648.51334172/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 687648.51334172, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 687648.51334172/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 687648.51334172/1 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 687648.51334172 as a fraction:
687648/1 / 1