Step 1:
The first step to converting 121408.8504331 to a fraction is to re-write 121408.8504331 in the form p/q where p and q are both positive integers. To start with, 121408.8504331 can be written as simply 121408.8504331/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 121408.8504331, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 121408.8504331/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 121408.8504331/1 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 121408.8504331 as a fraction:
728453/6 / 1