Step 1:
The first step to converting 538691.21459011 to a fraction is to re-write 538691.21459011 in the form p/q where p and q are both positive integers. To start with, 538691.21459011 can be written as simply 538691.21459011/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 538691.21459011, which in this case is 8. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 538691.21459011/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 538691.21459011/1 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 538691.21459011 as a fraction:
538691/1 / 1