Step 1:
The first step to converting 687985419.21722 to a fraction is to re-write 687985419.21722 in the form p/q where p and q are both positive integers. To start with, 687985419.21722 can be written as simply 687985419.21722/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 687985419.21722, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 687985419.21722/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 687985419.21722/1 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 687985419.21722 as a fraction:
687985419/1 / 1