Finding the Fourth Proportional to 2,143.10, 2,956.82 and 1,396.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.10 : 2,956.82 = 1,396.78 : x
2. Step 2: Convert to fraction form
   2,143.10/2,956.82 = 1,396.78/x
3. Step 3: Cross multiply
   2,143.10x = 2,956.82 × 1,396.78
4. Step 4: Simplify right side
   2,143.10x = 4,130,027.45
5. Step 5: Solve for x
   x = 4,130,027.45/2,143.10
6. Step 6: Final answer
   x = 1,927.13