Step 1:
The first step to converting 21523443.405509 to a fraction is to re-write 21523443.405509 in the form p/q where p and q are both positive integers. To start with, 21523443.405509 can be written as simply 21523443.405509/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 21523443.405509, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 21523443.405509/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 21523443.405509/1 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 21523443.405509 as a fraction:
21523443/1 / 1