Finding the Fourth Proportional to 1,411.74, 2,116.39 and 680.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.74 : 2,116.39 = 680.31 : x
2. Step 2: Convert to fraction form
   1,411.74/2,116.39 = 680.31/x
3. Step 3: Cross multiply
   1,411.74x = 2,116.39 × 680.31
4. Step 4: Simplify right side
   1,411.74x = 1,439,801.28
5. Step 5: Solve for x
   x = 1,439,801.28/1,411.74
6. Step 6: Final answer
   x = 1,019.88