Finding the Fourth Proportional to 2,142.56, 2,956.76 and 1,258.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.56 : 2,956.76 = 1,258.38 : x
2. Step 2: Convert to fraction form
   2,142.56/2,956.76 = 1,258.38/x
3. Step 3: Cross multiply
   2,142.56x = 2,956.76 × 1,258.38
4. Step 4: Simplify right side
   2,142.56x = 3,720,727.65
5. Step 5: Solve for x
   x = 3,720,727.65/2,142.56
6. Step 6: Final answer
   x = 1,736.58