Finding the Fourth Proportional to 1,078.76, 1,490.64 and 868.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.76 : 1,490.64 = 868.52 : x
2. Step 2: Convert to fraction form
   1,078.76/1,490.64 = 868.52/x
3. Step 3: Cross multiply
   1,078.76x = 1,490.64 × 868.52
4. Step 4: Simplify right side
   1,078.76x = 1,294,650.65
5. Step 5: Solve for x
   x = 1,294,650.65/1,078.76
6. Step 6: Final answer
   x = 1,200.13