Finding the Fourth Proportional to 1,392.59, 1,922.08 and 868.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.59 : 1,922.08 = 868.52 : x
2. Step 2: Convert to fraction form
   1,392.59/1,922.08 = 868.52/x
3. Step 3: Cross multiply
   1,392.59x = 1,922.08 × 868.52
4. Step 4: Simplify right side
   1,392.59x = 1,669,364.92
5. Step 5: Solve for x
   x = 1,669,364.92/1,392.59
6. Step 6: Final answer
   x = 1,198.75