Finding the Fourth Proportional to 1,411.49, 2,118.54 and 718.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.49 : 2,118.54 = 718.66 : x
2. Step 2: Convert to fraction form
   1,411.49/2,118.54 = 718.66/x
3. Step 3: Cross multiply
   1,411.49x = 2,118.54 × 718.66
4. Step 4: Simplify right side
   1,411.49x = 1,522,501.56
5. Step 5: Solve for x
   x = 1,522,501.56/1,411.49
6. Step 6: Final answer
   x = 1,078.65