Finding the Fourth Proportional to 10,834.38, 16,156.86 and 9,639.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,834.38 : 16,156.86 = 9,639.72 : x
2. Step 2: Convert to fraction form
   10,834.38/16,156.86 = 9,639.72/x
3. Step 3: Cross multiply
   10,834.38x = 16,156.86 × 9,639.72
4. Step 4: Simplify right side
   10,834.38x = 155,747,606.48
5. Step 5: Solve for x
   x = 155,747,606.48/10,834.38
6. Step 6: Final answer
   x = 14,375.31