Finding the Fourth Proportional to 2,082.80, 3,107.98 and 2,068.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,082.80 : 3,107.98 = 2,068.40 : x
2. Step 2: Convert to fraction form
   2,082.80/3,107.98 = 2,068.40/x
3. Step 3: Cross multiply
   2,082.80x = 3,107.98 × 2,068.40
4. Step 4: Simplify right side
   2,082.80x = 6,428,545.83
5. Step 5: Solve for x
   x = 6,428,545.83/2,082.80
6. Step 6: Final answer
   x = 3,086.49