Finding the Fourth Proportional to 3,855.55, 5,789.40 and 2,215.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.55 : 5,789.40 = 2,215.30 : x
2. Step 2: Convert to fraction form
   3,855.55/5,789.40 = 2,215.30/x
3. Step 3: Cross multiply
   3,855.55x = 5,789.40 × 2,215.30
4. Step 4: Simplify right side
   3,855.55x = 12,825,257.82
5. Step 5: Solve for x
   x = 12,825,257.82/3,855.55
6. Step 6: Final answer
   x = 3,326.44