Finding the Fourth Proportional to 10,864.71, 14,979.33 and 8,622.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,864.71 : 14,979.33 = 8,622.72 : x
2. Step 2: Convert to fraction form
   10,864.71/14,979.33 = 8,622.72/x
3. Step 3: Cross multiply
   10,864.71x = 14,979.33 × 8,622.72
4. Step 4: Simplify right side
   10,864.71x = 129,162,568.38
5. Step 5: Solve for x
   x = 129,162,568.38/10,864.71
6. Step 6: Final answer
   x = 11,888.27