Finding the Fourth Proportional to 7,768.96, 10,730.04 and 5,128.12

Step by Step Solution

1. Step 1: Write the proportion equation
   7,768.96 : 10,730.04 = 5,128.12 : x
2. Step 2: Convert to fraction form
   7,768.96/10,730.04 = 5,128.12/x
3. Step 3: Cross multiply
   7,768.96x = 10,730.04 × 5,128.12
4. Step 4: Simplify right side
   7,768.96x = 55,024,932.72
5. Step 5: Solve for x
   x = 55,024,932.72/7,768.96
6. Step 6: Final answer
   x = 7,082.66