Finding the Fourth Proportional to 1,392.48, 1,921.83 and 868.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.48 : 1,921.83 = 868.23 : x
2. Step 2: Convert to fraction form
   1,392.48/1,921.83 = 868.23/x
3. Step 3: Cross multiply
   1,392.48x = 1,921.83 × 868.23
4. Step 4: Simplify right side
   1,392.48x = 1,668,590.46
5. Step 5: Solve for x
   x = 1,668,590.46/1,392.48
6. Step 6: Final answer
   x = 1,198.29