Step 1:
The first step to converting 16400.249816078 to a fraction is to re-write 16400.249816078 in the form p/q where p and q are both positive integers. To start with, 16400.249816078 can be written as simply 16400.249816078/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 16400.249816078, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 16400.249816078/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 16400.249816078/1 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 16400.249816078 as a fraction:
65601/4 / 1