Finding the Fourth Proportional to 8,812.20, 12,162.09 and 5,456.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,812.20 : 12,162.09 = 5,456.10 : x
2. Step 2: Convert to fraction form
   8,812.20/12,162.09 = 5,456.10/x
3. Step 3: Cross multiply
   8,812.20x = 12,162.09 × 5,456.10
4. Step 4: Simplify right side
   8,812.20x = 66,357,579.25
5. Step 5: Solve for x
   x = 66,357,579.25/8,812.20
6. Step 6: Final answer
   x = 7,530.19