Finding the Fourth Proportional to 1,351.38, 1,864.20 and 957.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,351.38 : 1,864.20 = 957.72 : x
2. Step 2: Convert to fraction form
   1,351.38/1,864.20 = 957.72/x
3. Step 3: Cross multiply
   1,351.38x = 1,864.20 × 957.72
4. Step 4: Simplify right side
   1,351.38x = 1,785,381.62
5. Step 5: Solve for x
   x = 1,785,381.62/1,351.38
6. Step 6: Final answer
   x = 1,321.15