Finding the Fourth Proportional to 10,916.52, 15,051.96 and 9,128.04

Step by Step Solution

1. Step 1: Write the proportion equation
   10,916.52 : 15,051.96 = 9,128.04 : x
2. Step 2: Convert to fraction form
   10,916.52/15,051.96 = 9,128.04/x
3. Step 3: Cross multiply
   10,916.52x = 15,051.96 × 9,128.04
4. Step 4: Simplify right side
   10,916.52x = 137,394,892.96
5. Step 5: Solve for x
   x = 137,394,892.96/10,916.52
6. Step 6: Final answer
   x = 12,585.96