Finding the Fourth Proportional to 1,411.69, 2,118.08 and 681.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.69 : 2,118.08 = 681.21 : x
2. Step 2: Convert to fraction form
   1,411.69/2,118.08 = 681.21/x
3. Step 3: Cross multiply
   1,411.69x = 2,118.08 × 681.21
4. Step 4: Simplify right side
   1,411.69x = 1,442,843.28
5. Step 5: Solve for x
   x = 1,442,843.28/1,411.69
6. Step 6: Final answer
   x = 1,022.07