Finding the Fourth Proportional to 1,152.98, 1,591.08 and 680.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.98 : 1,591.08 = 680.89 : x
2. Step 2: Convert to fraction form
   1,152.98/1,591.08 = 680.89/x
3. Step 3: Cross multiply
   1,152.98x = 1,591.08 × 680.89
4. Step 4: Simplify right side
   1,152.98x = 1,083,350.46
5. Step 5: Solve for x
   x = 1,083,350.46/1,152.98
6. Step 6: Final answer
   x = 939.61