Step 1:
The first step to converting 18151688.997621 to a fraction is to re-write 18151688.997621 in the form p/q where p and q are both positive integers. To start with, 18151688.997621 can be written as simply 18151688.997621/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18151688.997621, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18151688.997621/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18151688.997621/1 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 18151688.997621 as a fraction:
18151688/1 / 1