Finding the Fourth Proportional to 1,399.62, 1,930.73 and 868.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.62 : 1,930.73 = 868.17 : x
2. Step 2: Convert to fraction form
   1,399.62/1,930.73 = 868.17/x
3. Step 3: Cross multiply
   1,399.62x = 1,930.73 × 868.17
4. Step 4: Simplify right side
   1,399.62x = 1,676,197.52
5. Step 5: Solve for x
   x = 1,676,197.52/1,399.62
6. Step 6: Final answer
   x = 1,197.61