Finding the Fourth Proportional to 9,011.28, 12,430.38 and 5,423.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,011.28 : 12,430.38 = 5,423.76 : x
2. Step 2: Convert to fraction form
   9,011.28/12,430.38 = 5,423.76/x
3. Step 3: Cross multiply
   9,011.28x = 12,430.38 × 5,423.76
4. Step 4: Simplify right side
   9,011.28x = 67,419,397.83
5. Step 5: Solve for x
   x = 67,419,397.83/9,011.28
6. Step 6: Final answer
   x = 7,481.67