Finding the Fourth Proportional to 1,204.72, 1,662.68 and 680.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,204.72 : 1,662.68 = 680.96 : x
2. Step 2: Convert to fraction form
   1,204.72/1,662.68 = 680.96/x
3. Step 3: Cross multiply
   1,204.72x = 1,662.68 × 680.96
4. Step 4: Simplify right side
   1,204.72x = 1,132,218.57
5. Step 5: Solve for x
   x = 1,132,218.57/1,204.72
6. Step 6: Final answer
   x = 939.82