Identify Decimal Digit: Identify the digit in the fourth decimal place.In the number 604.66943984, the fourth decimal place is occupied by the digit '9'.
Check for Rounding: Look at the digit to the right of the fourth decimal place to determine if we need to round up.The digit to the right of the fourth decimal place is '3'. Since this digit is less than 5, we do not round up the digit in the fourth decimal place.
Write Rounded Number: Write down the number rounded to four decimal places.Since we do not round up, the number 604.66943984 rounded to four decimal places is 604.6694.