Finding the Fourth Proportional to 1,411.20, 2,114.42 and 1,081.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.20 : 2,114.42 = 1,081.79 : x
2. Step 2: Convert to fraction form
   1,411.20/2,114.42 = 1,081.79/x
3. Step 3: Cross multiply
   1,411.20x = 2,114.42 × 1,081.79
4. Step 4: Simplify right side
   1,411.20x = 2,287,358.41
5. Step 5: Solve for x
   x = 2,287,358.41/1,411.20
6. Step 6: Final answer
   x = 1,620.86