Finding the Fourth Proportional to 1,399.21, 1,931.52 and 959.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.21 : 1,931.52 = 959.38 : x
2. Step 2: Convert to fraction form
   1,399.21/1,931.52 = 959.38/x
3. Step 3: Cross multiply
   1,399.21x = 1,931.52 × 959.38
4. Step 4: Simplify right side
   1,399.21x = 1,853,061.66
5. Step 5: Solve for x
   x = 1,853,061.66/1,399.21
6. Step 6: Final answer
   x = 1,324.36