Finding the Fourth Proportional to 2,016.80, 2,785.98 and 1,911.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.80 : 2,785.98 = 1,911.70 : x
2. Step 2: Convert to fraction form
   2,016.80/2,785.98 = 1,911.70/x
3. Step 3: Cross multiply
   2,016.80x = 2,785.98 × 1,911.70
4. Step 4: Simplify right side
   2,016.80x = 5,325,957.97
5. Step 5: Solve for x
   x = 5,325,957.97/2,016.80
6. Step 6: Final answer
   x = 2,640.80