Finding the Fourth Proportional to 11,958.42, 16,491.18 and 9,120.76

Step by Step Solution

1. Step 1: Write the proportion equation
   11,958.42 : 16,491.18 = 9,120.76 : x
2. Step 2: Convert to fraction form
   11,958.42/16,491.18 = 9,120.76/x
3. Step 3: Cross multiply
   11,958.42x = 16,491.18 × 9,120.76
4. Step 4: Simplify right side
   11,958.42x = 150,412,094.90
5. Step 5: Solve for x
   x = 150,412,094.90/11,958.42
6. Step 6: Final answer
   x = 12,577.92