Finding the Fourth Proportional to 9,311.94, 12,850.48 and 5,120.18

Step by Step Solution

1. Step 1: Write the proportion equation
   9,311.94 : 12,850.48 = 5,120.18 : x
2. Step 2: Convert to fraction form
   9,311.94/12,850.48 = 5,120.18/x
3. Step 3: Cross multiply
   9,311.94x = 12,850.48 × 5,120.18
4. Step 4: Simplify right side
   9,311.94x = 65,796,770.69
5. Step 5: Solve for x
   x = 65,796,770.69/9,311.94
6. Step 6: Final answer
   x = 7,065.85