Finding the Fourth Proportional to 1,204.45, 1,662.15 and 680.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,204.45 : 1,662.15 = 680.48 : x
2. Step 2: Convert to fraction form
   1,204.45/1,662.15 = 680.48/x
3. Step 3: Cross multiply
   1,204.45x = 1,662.15 × 680.48
4. Step 4: Simplify right side
   1,204.45x = 1,131,063.91
5. Step 5: Solve for x
   x = 1,131,063.91/1,204.45
6. Step 6: Final answer
   x = 939.07