Finding the Fourth Proportional to 12,109.50, 16,693.83 and 8,580.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,109.50 : 16,693.83 = 8,580.78 : x
2. Step 2: Convert to fraction form
   12,109.50/16,693.83 = 8,580.78/x
3. Step 3: Cross multiply
   12,109.50x = 16,693.83 × 8,580.78
4. Step 4: Simplify right side
   12,109.50x = 143,246,082.59
5. Step 5: Solve for x
   x = 143,246,082.59/12,109.50
6. Step 6: Final answer
   x = 11,829.23