Finding the Fourth Proportional to 2,216.92, 3,320.56 and 2,155.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.92 : 3,320.56 = 2,155.48 : x
2. Step 2: Convert to fraction form
   2,216.92/3,320.56 = 2,155.48/x
3. Step 3: Cross multiply
   2,216.92x = 3,320.56 × 2,155.48
4. Step 4: Simplify right side
   2,216.92x = 7,157,400.67
5. Step 5: Solve for x
   x = 7,157,400.67/2,216.92
6. Step 6: Final answer
   x = 3,228.53