Finding the Fourth Proportional to 868.52, 1,196.98 and 686.05

Step by Step Solution

1. Step 1: Write the proportion equation
   868.52 : 1,196.98 = 686.05 : x
2. Step 2: Convert to fraction form
   868.52/1,196.98 = 686.05/x
3. Step 3: Cross multiply
   868.52x = 1,196.98 × 686.05
4. Step 4: Simplify right side
   868.52x = 821,180.43
5. Step 5: Solve for x
   x = 821,180.43/868.52
6. Step 6: Final answer
   x = 945.49