Finding the Fourth Proportional to 2,143.72, 2,958.28 and 1,259.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.72 : 2,958.28 = 1,259.54 : x
2. Step 2: Convert to fraction form
   2,143.72/2,958.28 = 1,259.54/x
3. Step 3: Cross multiply
   2,143.72x = 2,958.28 × 1,259.54
4. Step 4: Simplify right side
   2,143.72x = 3,726,071.99
5. Step 5: Solve for x
   x = 3,726,071.99/2,143.72
6. Step 6: Final answer
   x = 1,738.13