Finding the Fourth Proportional to 1,392.33, 1,920.58 and 868.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.33 : 1,920.58 = 868.26 : x
2. Step 2: Convert to fraction form
   1,392.33/1,920.58 = 868.26/x
3. Step 3: Cross multiply
   1,392.33x = 1,920.58 × 868.26
4. Step 4: Simplify right side
   1,392.33x = 1,667,562.79
5. Step 5: Solve for x
   x = 1,667,562.79/1,392.33
6. Step 6: Final answer
   x = 1,197.68