Step 1:
The first step to converting 15490.666457901 to a fraction is to re-write 15490.666457901 in the form p/q where p and q are both positive integers. To start with, 15490.666457901 can be written as simply 15490.666457901/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15490.666457901, which in this case is 9. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15490.666457901/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15490.666457901/1 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 15490.666457901 as a fraction:
46472/3 / 1