Finding the Fourth Proportional to 1,152.42, 1,590.42 and 680.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.42 : 1,590.42 = 680.60 : x
2. Step 2: Convert to fraction form
   1,152.42/1,590.42 = 680.60/x
3. Step 3: Cross multiply
   1,152.42x = 1,590.42 × 680.60
4. Step 4: Simplify right side
   1,152.42x = 1,082,439.85
5. Step 5: Solve for x
   x = 1,082,439.85/1,152.42
6. Step 6: Final answer
   x = 939.28