Step 1:
The first step to converting 687964220.56472 to a fraction is to re-write 687964220.56472 in the form p/q where p and q are both positive integers. To start with, 687964220.56472 can be written as simply 687964220.56472/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 687964220.56472, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 687964220.56472/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 687964220.56472/1 each by 100000:
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 687964220.56472 as a fraction:
687964220/1 / 1