Finding the Fourth Proportional to 2,143.34, 2,957.10 and 1,357.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.34 : 2,957.10 = 1,357.28 : x
2. Step 2: Convert to fraction form
   2,143.34/2,957.10 = 1,357.28/x
3. Step 3: Cross multiply
   2,143.34x = 2,957.10 × 1,357.28
4. Step 4: Simplify right side
   2,143.34x = 4,013,612.69
5. Step 5: Solve for x
   x = 4,013,612.69/2,143.34
6. Step 6: Final answer
   x = 1,872.60