Finding the Fourth Proportional to 9,149.04, 12,616.42 and 8,137.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,149.04 : 12,616.42 = 8,137.55 : x
2. Step 2: Convert to fraction form
   9,149.04/12,616.42 = 8,137.55/x
3. Step 3: Cross multiply
   9,149.04x = 12,616.42 × 8,137.55
4. Step 4: Simplify right side
   9,149.04x = 102,666,748.57
5. Step 5: Solve for x
   x = 102,666,748.57/9,149.04
6. Step 6: Final answer
   x = 11,221.59