Finding the Fourth Proportional to 9,311.28, 12,849.60 and 5,119.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,311.28 : 12,849.60 = 5,119.56 : x
2. Step 2: Convert to fraction form
   9,311.28/12,849.60 = 5,119.56/x
3. Step 3: Cross multiply
   9,311.28x = 12,849.60 × 5,119.56
4. Step 4: Simplify right side
   9,311.28x = 65,784,298.18
5. Step 5: Solve for x
   x = 65,784,298.18/9,311.28
6. Step 6: Final answer
   x = 7,065.01