Finding the Fourth Proportional to 10,442.72, 15,655.28 and 7,147.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,442.72 : 15,655.28 = 7,147.68 : x
2. Step 2: Convert to fraction form
   10,442.72/15,655.28 = 7,147.68/x
3. Step 3: Cross multiply
   10,442.72x = 15,655.28 × 7,147.68
4. Step 4: Simplify right side
   10,442.72x = 111,898,931.75
5. Step 5: Solve for x
   x = 111,898,931.75/10,442.72
6. Step 6: Final answer
   x = 10,715.50