Finding the Fourth Proportional to 12,644.29, 17,402.31 and 9,281.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.29 : 17,402.31 = 9,281.78 : x
2. Step 2: Convert to fraction form
   12,644.29/17,402.31 = 9,281.78/x
3. Step 3: Cross multiply
   12,644.29x = 17,402.31 × 9,281.78
4. Step 4: Simplify right side
   12,644.29x = 161,524,366.50
5. Step 5: Solve for x
   x = 161,524,366.50/12,644.29
6. Step 6: Final answer
   x = 12,774.49