Finding the Fourth Proportional to 2,724.31, 4,086.56 and 1,242.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,724.31 : 4,086.56 = 1,242.91 : x
2. Step 2: Convert to fraction form
   2,724.31/4,086.56 = 1,242.91/x
3. Step 3: Cross multiply
   2,724.31x = 4,086.56 × 1,242.91
4. Step 4: Simplify right side
   2,724.31x = 5,079,226.29
5. Step 5: Solve for x
   x = 5,079,226.29/2,724.31
6. Step 6: Final answer
   x = 1,864.41