Finding the Fourth Proportional to 2,142.72, 2,957.24 and 1,258.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.72 : 2,957.24 = 1,258.64 : x
2. Step 2: Convert to fraction form
   2,142.72/2,957.24 = 1,258.64/x
3. Step 3: Cross multiply
   2,142.72x = 2,957.24 × 1,258.64
4. Step 4: Simplify right side
   2,142.72x = 3,722,100.55
5. Step 5: Solve for x
   x = 3,722,100.55/2,142.72
6. Step 6: Final answer
   x = 1,737.09