Finding the Fourth Proportional to 2,215.42, 3,057.19 and 1,271.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.42 : 3,057.19 = 1,271.28 : x
2. Step 2: Convert to fraction form
   2,215.42/3,057.19 = 1,271.28/x
3. Step 3: Cross multiply
   2,215.42x = 3,057.19 × 1,271.28
4. Step 4: Simplify right side
   2,215.42x = 3,886,544.50
5. Step 5: Solve for x
   x = 3,886,544.50/2,215.42
6. Step 6: Final answer
   x = 1,754.31