Finding the Fourth Proportional to 9,311.54, 12,849.60 and 5,119.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,311.54 : 12,849.60 = 5,119.76 : x
2. Step 2: Convert to fraction form
   9,311.54/12,849.60 = 5,119.76/x
3. Step 3: Cross multiply
   9,311.54x = 12,849.60 × 5,119.76
4. Step 4: Simplify right side
   9,311.54x = 65,786,868.10
5. Step 5: Solve for x
   x = 65,786,868.10/9,311.54
6. Step 6: Final answer
   x = 7,065.09