Finding the Fourth Proportional to 1,399.39, 1,930.14 and 868.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.39 : 1,930.14 = 868.57 : x
2. Step 2: Convert to fraction form
   1,399.39/1,930.14 = 868.57/x
3. Step 3: Cross multiply
   1,399.39x = 1,930.14 × 868.57
4. Step 4: Simplify right side
   1,399.39x = 1,676,461.70
5. Step 5: Solve for x
   x = 1,676,461.70/1,399.39
6. Step 6: Final answer
   x = 1,198.00