Finding the Fourth Proportional to 1,411.87, 2,116.55 and 718.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.87 : 2,116.55 = 718.15 : x
2. Step 2: Convert to fraction form
   1,411.87/2,116.55 = 718.15/x
3. Step 3: Cross multiply
   1,411.87x = 2,116.55 × 718.15
4. Step 4: Simplify right side
   1,411.87x = 1,519,996.79
5. Step 5: Solve for x
   x = 1,519,996.79/1,411.87
6. Step 6: Final answer
   x = 1,076.58