Finding the Fourth Proportional to 2,215.77, 3,057.88 and 1,271.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.77 : 3,057.88 = 1,271.55 : x
2. Step 2: Convert to fraction form
   2,215.77/3,057.88 = 1,271.55/x
3. Step 3: Cross multiply
   2,215.77x = 3,057.88 × 1,271.55
4. Step 4: Simplify right side
   2,215.77x = 3,888,250.91
5. Step 5: Solve for x
   x = 3,888,250.91/2,215.77
6. Step 6: Final answer
   x = 1,754.81