Finding the Fourth Proportional to 1,079.39, 1,489.33 and 686.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.39 : 1,489.33 = 686.27 : x
2. Step 2: Convert to fraction form
   1,079.39/1,489.33 = 686.27/x
3. Step 3: Cross multiply
   1,079.39x = 1,489.33 × 686.27
4. Step 4: Simplify right side
   1,079.39x = 1,022,082.50
5. Step 5: Solve for x
   x = 1,022,082.50/1,079.39
6. Step 6: Final answer
   x = 946.91