Finding the Fourth Proportional to 1,204.88, 1,662.72 and 680.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,204.88 : 1,662.72 = 680.90 : x
2. Step 2: Convert to fraction form
   1,204.88/1,662.72 = 680.90/x
3. Step 3: Cross multiply
   1,204.88x = 1,662.72 × 680.90
4. Step 4: Simplify right side
   1,204.88x = 1,132,147.65
5. Step 5: Solve for x
   x = 1,132,147.65/1,204.88
6. Step 6: Final answer
   x = 939.63