Finding the Fourth Proportional to 2,215.81, 3,057.37 and 1,271.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.81 : 3,057.37 = 1,271.49 : x
2. Step 2: Convert to fraction form
   2,215.81/3,057.37 = 1,271.49/x
3. Step 3: Cross multiply
   2,215.81x = 3,057.37 × 1,271.49
4. Step 4: Simplify right side
   2,215.81x = 3,887,415.38
5. Step 5: Solve for x
   x = 3,887,415.38/2,215.81
6. Step 6: Final answer
   x = 1,754.40