Finding the Fourth Proportional to 2,142.15, 2,956.37 and 1,257.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.15 : 2,956.37 = 1,257.92 : x
2. Step 2: Convert to fraction form
   2,142.15/2,956.37 = 1,257.92/x
3. Step 3: Cross multiply
   2,142.15x = 2,956.37 × 1,257.92
4. Step 4: Simplify right side
   2,142.15x = 3,718,855.88
5. Step 5: Solve for x
   x = 3,718,855.88/2,142.15
6. Step 6: Final answer
   x = 1,736.04