Step 1:
The first step to converting 12021.904100853 to a fraction is to re-write 12021.904100853 in the form p/q where p and q are both positive integers. To start with, 12021.904100853 can be written as simply 12021.904100853/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 12021.904100853, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 12021.904100853/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 12021.904100853/1 each by 1000000000:
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 12021.904100853 as a fraction:
120219/10 / 1