Finding the Fourth Proportional to 1,152.89, 1,590.65 and 680.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.89 : 1,590.65 = 680.83 : x
2. Step 2: Convert to fraction form
   1,152.89/1,590.65 = 680.83/x
3. Step 3: Cross multiply
   1,152.89x = 1,590.65 × 680.83
4. Step 4: Simplify right side
   1,152.89x = 1,082,959.97
5. Step 5: Solve for x
   x = 1,082,959.97/1,152.89
6. Step 6: Final answer
   x = 939.34