Finding the Fourth Proportional to 2,215.57, 3,057.38 and 1,271.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.57 : 3,057.38 = 1,271.18 : x
2. Step 2: Convert to fraction form
   2,215.57/3,057.38 = 1,271.18/x
3. Step 3: Cross multiply
   2,215.57x = 3,057.38 × 1,271.18
4. Step 4: Simplify right side
   2,215.57x = 3,886,480.31
5. Step 5: Solve for x
   x = 3,886,480.31/2,215.57
6. Step 6: Final answer
   x = 1,754.17