Finding the Fourth Proportional to 1,960.31, 2,939.43 and 864.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,960.31 : 2,939.43 = 864.16 : x
2. Step 2: Convert to fraction form
   1,960.31/2,939.43 = 864.16/x
3. Step 3: Cross multiply
   1,960.31x = 2,939.43 × 864.16
4. Step 4: Simplify right side
   1,960.31x = 2,540,137.83
5. Step 5: Solve for x
   x = 2,540,137.83/1,960.31
6. Step 6: Final answer
   x = 1,295.78