Step 1:
The first step to converting 551721.9424136 to a fraction is to re-write 551721.9424136 in the form p/q where p and q are both positive integers. To start with, 551721.9424136 can be written as simply 551721.9424136/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 551721.9424136, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 551721.9424136/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 551721.9424136/1 each by 10000000:
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 551721.9424136 as a fraction:
551722/1 / 1