Finding the Fourth Proportional to 8,105.89, 12,154.20 and 4,821.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,105.89 : 12,154.20 = 4,821.28 : x
2. Step 2: Convert to fraction form
   8,105.89/12,154.20 = 4,821.28/x
3. Step 3: Cross multiply
   8,105.89x = 12,154.20 × 4,821.28
4. Step 4: Simplify right side
   8,105.89x = 58,598,801.38
5. Step 5: Solve for x
   x = 58,598,801.38/8,105.89
6. Step 6: Final answer
   x = 7,229.16