Finding the Fourth Proportional to 2,229.72, 3,342.54 and 1,405.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.72 : 3,342.54 = 1,405.56 : x
2. Step 2: Convert to fraction form
   2,229.72/3,342.54 = 1,405.56/x
3. Step 3: Cross multiply
   2,229.72x = 3,342.54 × 1,405.56
4. Step 4: Simplify right side
   2,229.72x = 4,698,140.52
5. Step 5: Solve for x
   x = 4,698,140.52/2,229.72
6. Step 6: Final answer
   x = 2,107.05