Step 1:
The first step to converting 18139299.636453 to a fraction is to re-write 18139299.636453 in the form p/q where p and q are both positive integers. To start with, 18139299.636453 can be written as simply 18139299.636453/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 18139299.636453, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 18139299.636453/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 18139299.636453/1 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 18139299.636453 as a fraction:
18139299/1 / 1