Step 1:
The first step to converting 16123821.21018 to a fraction is to re-write 16123821.21018 in the form p/q where p and q are both positive integers. To start with, 16123821.21018 can be written as simply 16123821.21018/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 16123821.21018, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 16123821.21018/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 16123821.21018/1 each by 100000:
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 16123821.21018 as a fraction:
16123821/1 / 1