Finding the Fourth Proportional to 9,108.63, 13,636.71 and 8,158.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,108.63 : 13,636.71 = 8,158.86 : x
2. Step 2: Convert to fraction form
   9,108.63/13,636.71 = 8,158.86/x
3. Step 3: Cross multiply
   9,108.63x = 13,636.71 × 8,158.86
4. Step 4: Simplify right side
   9,108.63x = 111,260,007.75
5. Step 5: Solve for x
   x = 111,260,007.75/9,108.63
6. Step 6: Final answer
   x = 12,214.79