Step 1:
The first step to converting 129921.2456512 to a fraction is to re-write 129921.2456512 in the form p/q where p and q are both positive integers. To start with, 129921.2456512 can be written as simply 129921.2456512/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 129921.2456512, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 129921.2456512/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 129921.2456512/1 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 129921.2456512 as a fraction:
519685/4 / 1