Finding the Fourth Proportional to 9,665.72, 13,345.11 and 7,423.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,665.72 : 13,345.11 = 7,423.58 : x
2. Step 2: Convert to fraction form
   9,665.72/13,345.11 = 7,423.58/x
3. Step 3: Cross multiply
   9,665.72x = 13,345.11 × 7,423.58
4. Step 4: Simplify right side
   9,665.72x = 99,068,491.69
5. Step 5: Solve for x
   x = 99,068,491.69/9,665.72
6. Step 6: Final answer
   x = 10,249.47