Finding the Fourth Proportional to 1,152.55, 1,591.04 and 680.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.55 : 1,591.04 = 680.28 : x
2. Step 2: Convert to fraction form
   1,152.55/1,591.04 = 680.28/x
3. Step 3: Cross multiply
   1,152.55x = 1,591.04 × 680.28
4. Step 4: Simplify right side
   1,152.55x = 1,082,352.69
5. Step 5: Solve for x
   x = 1,082,352.69/1,152.55
6. Step 6: Final answer
   x = 939.09