Finding the Fourth Proportional to 1,204.51, 1,661.92 and 680.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,204.51 : 1,661.92 = 680.55 : x
2. Step 2: Convert to fraction form
   1,204.51/1,661.92 = 680.55/x
3. Step 3: Cross multiply
   1,204.51x = 1,661.92 × 680.55
4. Step 4: Simplify right side
   1,204.51x = 1,131,019.66
5. Step 5: Solve for x
   x = 1,131,019.66/1,204.51
6. Step 6: Final answer
   x = 938.99