Step 1:
The first step to converting 81628128.720436 to a fraction is to re-write 81628128.720436 in the form p/q where p and q are both positive integers. To start with, 81628128.720436 can be written as simply 81628128.720436/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 81628128.720436, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 81628128.720436/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 81628128.720436/1 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 81628128.720436 as a fraction:
81628128/1 / 1