Finding the Fourth Proportional to 1,392.38, 1,922.10 and 868.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.38 : 1,922.10 = 868.76 : x
2. Step 2: Convert to fraction form
   1,392.38/1,922.10 = 868.76/x
3. Step 3: Cross multiply
   1,392.38x = 1,922.10 × 868.76
4. Step 4: Simplify right side
   1,392.38x = 1,669,843.60
5. Step 5: Solve for x
   x = 1,669,843.60/1,392.38
6. Step 6: Final answer
   x = 1,199.27