To round to 3 decimal places, look at the digit in the 4th decimal place.
• 4.5678 → the 3rd decimal digit is 7, the 4th decimal digit is 8
• The 4th decimal digit is 8, which is 5 or more, so we round up
• 7 becomes 8
• 4.5678 rounded to 3 decimal places = 4.568
Final Answer: 4.568