Step 1:
The first step to converting 18189933.618407 to a fraction is to re-write 18189933.618407 in the form p/q where p and q are both positive integers. To start with, 18189933.618407 can be written as simply 18189933.618407/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18189933.618407, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18189933.618407/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18189933.618407/1 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 18189933.618407 as a fraction:
18189933/1 / 1