Finding the Fourth Proportional to 10,440.72, 15,652.28 and 7,145.68

Step by Step Solution

1. Step 1: Write the proportion equation
   10,440.72 : 15,652.28 = 7,145.68 : x
2. Step 2: Convert to fraction form
   10,440.72/15,652.28 = 7,145.68/x
3. Step 3: Cross multiply
   10,440.72x = 15,652.28 × 7,145.68
4. Step 4: Simplify right side
   10,440.72x = 111,846,184.15
5. Step 5: Solve for x
   x = 111,846,184.15/10,440.72
6. Step 6: Final answer
   x = 10,712.50