Step 1:
The first step to converting 1290649204.6721 to a fraction is to re-write 1290649204.6721 in the form p/q where p and q are both positive integers. To start with, 1290649204.6721 can be written as simply 1290649204.6721/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1290649204.6721, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1290649204.6721/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1290649204.6721/1 each by 10000:
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 1290649204.6721 as a fraction:
1290649204/1 / 1