Finding the Fourth Proportional to 883.55, 1,323.30 and 863.30

Step by Step Solution

1. Step 1: Write the proportion equation
   883.55 : 1,323.30 = 863.30 : x
2. Step 2: Convert to fraction form
   883.55/1,323.30 = 863.30/x
3. Step 3: Cross multiply
   883.55x = 1,323.30 × 863.30
4. Step 4: Simplify right side
   883.55x = 1,142,404.89
5. Step 5: Solve for x
   x = 1,142,404.89/883.55
6. Step 6: Final answer
   x = 1,292.97