Finding the Fourth Proportional to 2,142.72, 3,214.28 and 755.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.72 : 3,214.28 = 755.90 : x
2. Step 2: Convert to fraction form
   2,142.72/3,214.28 = 755.90/x
3. Step 3: Cross multiply
   2,142.72x = 3,214.28 × 755.90
4. Step 4: Simplify right side
   2,142.72x = 2,429,674.25
5. Step 5: Solve for x
   x = 2,429,674.25/2,142.72
6. Step 6: Final answer
   x = 1,133.92