Finding the Fourth Proportional to 11,665.59, 16,104.69 and 9,372.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,665.59 : 16,104.69 = 9,372.09 : x
2. Step 2: Convert to fraction form
   11,665.59/16,104.69 = 9,372.09/x
3. Step 3: Cross multiply
   11,665.59x = 16,104.69 × 9,372.09
4. Step 4: Simplify right side
   11,665.59x = 150,934,604.10
5. Step 5: Solve for x
   x = 150,934,604.10/11,665.59
6. Step 6: Final answer
   x = 12,938.45