Finding the Fourth Proportional to 2,143.75, 2,958.72 and 1,259.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.75 : 2,958.72 = 1,259.39 : x
2. Step 2: Convert to fraction form
   2,143.75/2,958.72 = 1,259.39/x
3. Step 3: Cross multiply
   2,143.75x = 2,958.72 × 1,259.39
4. Step 4: Simplify right side
   2,143.75x = 3,726,182.38
5. Step 5: Solve for x
   x = 3,726,182.38/2,143.75
6. Step 6: Final answer
   x = 1,738.16