I need help with the 4th year where it's blank.

January 1. The factory manager estimates the machine will produce 491,000 units of product during its life. It actually produces the following units: 121,900 in Year 1, 122,600 in Year 2, 120,500 in Year 3, 136,000 in Year 4. The total number of units produced by the end of Year 4 exceeds the original estimate-this difference was not predicted. Note: The machine cannot be depreciated below its estimated salvage value. Required: Compute depreciation for each year (and total depreciation of all years combined) for the machine under each depreciation method. (Round your per unit depreciation to 2 decimal places. Round your answers to the nearest whole dollar.) Complete this question by entering your answers in the tabs below. Straight Line Units of Production DDB Compute depreciation for each year (and total depreciation of all years combined) for the machine under the Units of production. Year per unit Depreciation Expense $ 48,760 Year 1 Year 2 Units of Production Depreciable Depreciation Units Units 121,900 121,900 $ 0.40 122,600 122,600 $ 0.40 120,500 120,500 $ 0.40 136,000 $ 0.40 L..... $ 487,750 Year 3 49,040 48,200 50,400 196,400 Year 4 BA $ Total