Finding the Fourth Proportional to 2,724.47, 4,086.75 and 776.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,724.47 : 4,086.75 = 776.72 : x
2. Step 2: Convert to fraction form
   2,724.47/4,086.75 = 776.72/x
3. Step 3: Cross multiply
   2,724.47x = 4,086.75 × 776.72
4. Step 4: Simplify right side
   2,724.47x = 3,174,273.59
5. Step 5: Solve for x
   x = 3,174,273.59/2,724.47
6. Step 6: Final answer
   x = 1,165.10