Finding the Fourth Proportional to 3,432.72, 4,743.24 and 2,688.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,432.72 : 4,743.24 = 2,688.72 : x
2. Step 2: Convert to fraction form
   3,432.72/4,743.24 = 2,688.72/x
3. Step 3: Cross multiply
   3,432.72x = 4,743.24 × 2,688.72
4. Step 4: Simplify right side
   3,432.72x = 12,753,244.25
5. Step 5: Solve for x
   x = 12,753,244.25/3,432.72
6. Step 6: Final answer
   x = 3,715.20