Finding the Fourth Proportional to 1,411.20, 1,947.41 and 781.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.20 : 1,947.41 = 781.71 : x
2. Step 2: Convert to fraction form
   1,411.20/1,947.41 = 781.71/x
3. Step 3: Cross multiply
   1,411.20x = 1,947.41 × 781.71
4. Step 4: Simplify right side
   1,411.20x = 1,522,311.83
5. Step 5: Solve for x
   x = 1,522,311.83/1,411.20
6. Step 6: Final answer
   x = 1,078.74