Finding the Fourth Proportional to 1,204.47, 1,662.20 and 680.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,204.47 : 1,662.20 = 680.50 : x
2. Step 2: Convert to fraction form
   1,204.47/1,662.20 = 680.50/x
3. Step 3: Cross multiply
   1,204.47x = 1,662.20 × 680.50
4. Step 4: Simplify right side
   1,204.47x = 1,131,127.10
5. Step 5: Solve for x
   x = 1,131,127.10/1,204.47
6. Step 6: Final answer
   x = 939.11