Finding the Fourth Proportional to 12,109.13, 16,704.32 and 8,131.62

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.13 : 16,704.32 = 8,131.62 : x
2. Step 2: Convert to fraction form
   12,109.13/16,704.32 = 8,131.62/x
3. Step 3: Cross multiply
   12,109.13x = 16,704.32 × 8,131.62
4. Step 4: Simplify right side
   12,109.13x = 135,833,141.94
5. Step 5: Solve for x
   x = 135,833,141.94/12,109.13
6. Step 6: Final answer
   x = 11,217.42