Finding the Fourth Proportional to 2,215.56, 3,325.90 and 1,339.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.56 : 3,325.90 = 1,339.40 : x
2. Step 2: Convert to fraction form
   2,215.56/3,325.90 = 1,339.40/x
3. Step 3: Cross multiply
   2,215.56x = 3,325.90 × 1,339.40
4. Step 4: Simplify right side
   2,215.56x = 4,454,710.46
5. Step 5: Solve for x
   x = 4,454,710.46/2,215.56
6. Step 6: Final answer
   x = 2,010.65