Step 1:
The first step to converting 15217979.642657 to a fraction is to re-write 15217979.642657 in the form p/q where p and q are both positive integers. To start with, 15217979.642657 can be written as simply 15217979.642657/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 15217979.642657, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 15217979.642657/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 15217979.642657/1 each by 1000000:
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 15217979.642657 as a fraction:
15217979/1 / 1