Step 1:
The first step to converting 3988517.6787518 to a fraction is to re-write 3988517.6787518 in the form p/q where p and q are both positive integers. To start with, 3988517.6787518 can be written as simply 3988517.6787518/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 3988517.6787518, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 3988517.6787518/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 3988517.6787518/1 each by 10000000:
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 3988517.6787518 as a fraction:
3988517/1 / 1