Finding the Fourth Proportional to 2,143.24, 2,956.43 and 1,555.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.24 : 2,956.43 = 1,555.18 : x
2. Step 2: Convert to fraction form
   2,143.24/2,956.43 = 1,555.18/x
3. Step 3: Cross multiply
   2,143.24x = 2,956.43 × 1,555.18
4. Step 4: Simplify right side
   2,143.24x = 4,597,780.81
5. Step 5: Solve for x
   x = 4,597,780.81/2,143.24
6. Step 6: Final answer
   x = 2,145.25