Finding the Fourth Proportional to 2,143.56, 3,215.48 and 756.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.56 : 3,215.48 = 756.72 : x
2. Step 2: Convert to fraction form
   2,143.56/3,215.48 = 756.72/x
3. Step 3: Cross multiply
   2,143.56x = 3,215.48 × 756.72
4. Step 4: Simplify right side
   2,143.56x = 2,433,218.03
5. Step 5: Solve for x
   x = 2,433,218.03/2,143.56
6. Step 6: Final answer
   x = 1,135.13