Finding the Fourth Proportional to 2,142.79, 2,956.51 and 1,258.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.79 : 2,956.51 = 1,258.42 : x
2. Step 2: Convert to fraction form
   2,142.79/2,956.51 = 1,258.42/x
3. Step 3: Cross multiply
   2,142.79x = 2,956.51 × 1,258.42
4. Step 4: Simplify right side
   2,142.79x = 3,720,531.31
5. Step 5: Solve for x
   x = 3,720,531.31/2,142.79
6. Step 6: Final answer
   x = 1,736.30