Finding the Fourth Proportional to 1,411.79, 2,118.11 and 681.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.79 : 2,118.11 = 681.39 : x
2. Step 2: Convert to fraction form
   1,411.79/2,118.11 = 681.39/x
3. Step 3: Cross multiply
   1,411.79x = 2,118.11 × 681.39
4. Step 4: Simplify right side
   1,411.79x = 1,443,255.57
5. Step 5: Solve for x
   x = 1,443,255.57/1,411.79
6. Step 6: Final answer
   x = 1,022.29