Finding the Fourth Proportional to 3,978.29, 5,490.52 and 2,718.95

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.29 : 5,490.52 = 2,718.95 : x
2. Step 2: Convert to fraction form
   3,978.29/5,490.52 = 2,718.95/x
3. Step 3: Cross multiply
   3,978.29x = 5,490.52 × 2,718.95
4. Step 4: Simplify right side
   3,978.29x = 14,928,415.10
5. Step 5: Solve for x
   x = 14,928,415.10/3,978.29
6. Step 6: Final answer
   x = 3,752.47