Finding the Fourth Proportional to 1,366.20, 1,885.28 and 868.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.20 : 1,885.28 = 868.86 : x
2. Step 2: Convert to fraction form
   1,366.20/1,885.28 = 868.86/x
3. Step 3: Cross multiply
   1,366.20x = 1,885.28 × 868.86
4. Step 4: Simplify right side
   1,366.20x = 1,638,040.04
5. Step 5: Solve for x
   x = 1,638,040.04/1,366.20
6. Step 6: Final answer
   x = 1,198.98