Finding the Fourth Proportional to 1,152.84, 1,591.12 and 680.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.84 : 1,591.12 = 680.86 : x
2. Step 2: Convert to fraction form
   1,152.84/1,591.12 = 680.86/x
3. Step 3: Cross multiply
   1,152.84x = 1,591.12 × 680.86
4. Step 4: Simplify right side
   1,152.84x = 1,083,318.60
5. Step 5: Solve for x
   x = 1,083,318.60/1,152.84
6. Step 6: Final answer
   x = 939.70