Finding the Fourth Proportional to 1,393.29, 1,921.05 and 868.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.29 : 1,921.05 = 868.41 : x
2. Step 2: Convert to fraction form
   1,393.29/1,921.05 = 868.41/x
3. Step 3: Cross multiply
   1,393.29x = 1,921.05 × 868.41
4. Step 4: Simplify right side
   1,393.29x = 1,668,259.03
5. Step 5: Solve for x
   x = 1,668,259.03/1,393.29
6. Step 6: Final answer
   x = 1,197.35