Finding the Fourth Proportional to 2,139.47, 2,952.31 and 1,255.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.47 : 2,952.31 = 1,255.15 : x
2. Step 2: Convert to fraction form
   2,139.47/2,952.31 = 1,255.15/x
3. Step 3: Cross multiply
   2,139.47x = 2,952.31 × 1,255.15
4. Step 4: Simplify right side
   2,139.47x = 3,705,591.90
5. Step 5: Solve for x
   x = 3,705,591.90/2,139.47
6. Step 6: Final answer
   x = 1,732.01