Finding the Fourth Proportional to 2,228.30, 3,345.15 and 2,212.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,228.30 : 3,345.15 = 2,212.10 : x
2. Step 2: Convert to fraction form
   2,228.30/3,345.15 = 2,212.10/x
3. Step 3: Cross multiply
   2,228.30x = 3,345.15 × 2,212.10
4. Step 4: Simplify right side
   2,228.30x = 7,399,806.32
5. Step 5: Solve for x
   x = 7,399,806.32/2,228.30
6. Step 6: Final answer
   x = 3,320.83