Finding the Fourth Proportional to 1,393.58, 1,922.54 and 868.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.58 : 1,922.54 = 868.70 : x
2. Step 2: Convert to fraction form
   1,393.58/1,922.54 = 868.70/x
3. Step 3: Cross multiply
   1,393.58x = 1,922.54 × 868.70
4. Step 4: Simplify right side
   1,393.58x = 1,670,110.50
5. Step 5: Solve for x
   x = 1,670,110.50/1,393.58
6. Step 6: Final answer
   x = 1,198.43