Finding the Fourth Proportional to 2,216.28, 3,057.76 and 1,271.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.28 : 3,057.76 = 1,271.78 : x
2. Step 2: Convert to fraction form
   2,216.28/3,057.76 = 1,271.78/x
3. Step 3: Cross multiply
   2,216.28x = 3,057.76 × 1,271.78
4. Step 4: Simplify right side
   2,216.28x = 3,888,798.01
5. Step 5: Solve for x
   x = 3,888,798.01/2,216.28
6. Step 6: Final answer
   x = 1,754.65