Finding the Fourth Proportional to 2,158.50, 3,238.14 and 1,428.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.50 : 3,238.14 = 1,428.68 : x
2. Step 2: Convert to fraction form
   2,158.50/3,238.14 = 1,428.68/x
3. Step 3: Cross multiply
   2,158.50x = 3,238.14 × 1,428.68
4. Step 4: Simplify right side
   2,158.50x = 4,626,265.86
5. Step 5: Solve for x
   x = 4,626,265.86/2,158.50
6. Step 6: Final answer
   x = 2,143.28