Step 1:
The first step to converting 15881.515898448 to a fraction is to re-write 15881.515898448 in the form p/q where p and q are both positive integers. To start with, 15881.515898448 can be written as simply 15881.515898448/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15881.515898448, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15881.515898448/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15881.515898448/1 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 15881.515898448 as a fraction:
492327/31 / 1