The answer is 1,129.87
If you need to round to 2 decimal places you want two numbers after the decimal point.
If you were to have the number 1,129.875 and you wished to round to two decimal places the third number after the decimal tells you whether it will round down or up. If the third number after the decimal point is equal to 5 or more the number before it (in this case the second number after the decimal point) will increase by one. For this example 1,129.875 to two decimal places is 1,129.88.