Finding the Fourth Proportional to 8,522.28, 12,768.06 and 7,134.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,522.28 : 12,768.06 = 7,134.12 : x
2. Step 2: Convert to fraction form
   8,522.28/12,768.06 = 7,134.12/x
3. Step 3: Cross multiply
   8,522.28x = 12,768.06 × 7,134.12
4. Step 4: Simplify right side
   8,522.28x = 91,088,872.21
5. Step 5: Solve for x
   x = 91,088,872.21/8,522.28
6. Step 6: Final answer
   x = 10,688.32