Finding the Fourth Proportional to 12,227.50, 16,872.78 and 9,715.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,227.50 : 16,872.78 = 9,715.69 : x
2. Step 2: Convert to fraction form
   12,227.50/16,872.78 = 9,715.69/x
3. Step 3: Cross multiply
   12,227.50x = 16,872.78 × 9,715.69
4. Step 4: Simplify right side
   12,227.50x = 163,930,699.92
5. Step 5: Solve for x
   x = 163,930,699.92/12,227.50
6. Step 6: Final answer
   x = 13,406.72