Finding the Fourth Proportional to 9,156.96, 12,645 and 8,665.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,156.96 : 12,645 = 8,665.92 : x
2. Step 2: Convert to fraction form
   9,156.96/12,645 = 8,665.92/x
3. Step 3: Cross multiply
   9,156.96x = 12,645 × 8,665.92
4. Step 4: Simplify right side
   9,156.96x = 109,580,558.40
5. Step 5: Solve for x
   x = 109,580,558.40/9,156.96
6. Step 6: Final answer
   x = 11,966.91