Step 1:
The first step to converting 170858990.21847 to a fraction is to re-write 170858990.21847 in the form p/q where p and q are both positive integers. To start with, 170858990.21847 can be written as simply 170858990.21847/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 170858990.21847, which in this case is 5. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 170858990.21847/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 170858990.21847/1 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 170858990.21847 as a fraction:
170858990/1 / 1