Finding the Fourth Proportional to 1,100.43, 1,517.94 and 680.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.43 : 1,517.94 = 680.43 : x
2. Step 2: Convert to fraction form
   1,100.43/1,517.94 = 680.43/x
3. Step 3: Cross multiply
   1,100.43x = 1,517.94 × 680.43
4. Step 4: Simplify right side
   1,100.43x = 1,032,851.91
5. Step 5: Solve for x
   x = 1,032,851.91/1,100.43
6. Step 6: Final answer
   x = 938.59