Answer:
3.981071706 x 10^5
Explanation:
In standard form, a number is written as a decimal multiplied by a power of 10. To convert 398107.1706 to standard form, we can move the decimal point until we have a number between 1 and 10 and a power of 10 that will make the original number.
398107.1706 = 3.981071706 x 10^5