Finding the Fourth Proportional to 2,139.54, 3,207.55 and 952.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.54 : 3,207.55 = 952.71 : x
2. Step 2: Convert to fraction form
   2,139.54/3,207.55 = 952.71/x
3. Step 3: Cross multiply
   2,139.54x = 3,207.55 × 952.71
4. Step 4: Simplify right side
   2,139.54x = 3,055,864.96
5. Step 5: Solve for x
   x = 3,055,864.96/2,139.54
6. Step 6: Final answer
   x = 1,428.28