Finding the Fourth Proportional to 1,399.70, 1,930.83 and 868.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.70 : 1,930.83 = 868.41 : x
2. Step 2: Convert to fraction form
   1,399.70/1,930.83 = 868.41/x
3. Step 3: Cross multiply
   1,399.70x = 1,930.83 × 868.41
4. Step 4: Simplify right side
   1,399.70x = 1,676,752.08
5. Step 5: Solve for x
   x = 1,676,752.08/1,399.70
6. Step 6: Final answer
   x = 1,197.94