Step 1:
The first step to converting 13398.400399958 to a fraction is to re-write 13398.400399958 in the form p/q where p and q are both positive integers. To start with, 13398.400399958 can be written as simply 13398.400399958/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 13398.400399958, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 13398.400399958/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 13398.400399958/1 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 13398.400399958 as a fraction:
66992/5 / 1