Final answer:
To round 345 045 028.05 to the nearest thousandth, look at the ten-thousandths digit; with '5' in that position, the number rounds up to 345 045 028.050.
Step-by-step explanation:
The task is to round the number 345 045 028.05 to the nearest thousandth. To round a number to the nearest thousandth, we look at the digit in the ten-thousandths place. In this case, the ten-thousandths place is '5', which is equal to or greater than five, so we round the thousandths place up. Therefore, the number 345 045 028.05, when rounded to the nearest thousandth, is 345 045 028.050.