Finding the Fourth Proportional to 868.85, 1,200.55 and 758.15

Step by Step Solution

1. Step 1: Write the proportion equation
   868.85 : 1,200.55 = 758.15 : x
2. Step 2: Convert to fraction form
   868.85/1,200.55 = 758.15/x
3. Step 3: Cross multiply
   868.85x = 1,200.55 × 758.15
4. Step 4: Simplify right side
   868.85x = 910,196.98
5. Step 5: Solve for x
   x = 910,196.98/868.85
6. Step 6: Final answer
   x = 1,047.59