Finding the Fourth Proportional to 7,356.20, 10,139.76 and 5,760.16

Step by Step Solution

1. Step 1: Write the proportion equation
   7,356.20 : 10,139.76 = 5,760.16 : x
2. Step 2: Convert to fraction form
   7,356.20/10,139.76 = 5,760.16/x
3. Step 3: Cross multiply
   7,356.20x = 10,139.76 × 5,760.16
4. Step 4: Simplify right side
   7,356.20x = 58,406,639.96
5. Step 5: Solve for x
   x = 58,406,639.96/7,356.20
6. Step 6: Final answer
   x = 7,939.78