Finding the Fourth Proportional to 2,165.43, 3,253.57 and 1,385.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.43 : 3,253.57 = 1,385.81 : x
2. Step 2: Convert to fraction form
   2,165.43/3,253.57 = 1,385.81/x
3. Step 3: Cross multiply
   2,165.43x = 3,253.57 × 1,385.81
4. Step 4: Simplify right side
   2,165.43x = 4,508,822.31
5. Step 5: Solve for x
   x = 4,508,822.31/2,165.43
6. Step 6: Final answer
   x = 2,082.18