Finding the Fourth Proportional to 8,121.42, 12,183.06 and 4,429.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,121.42 : 12,183.06 = 4,429.05 : x
2. Step 2: Convert to fraction form
   8,121.42/12,183.06 = 4,429.05/x
3. Step 3: Cross multiply
   8,121.42x = 12,183.06 × 4,429.05
4. Step 4: Simplify right side
   8,121.42x = 53,959,381.89
5. Step 5: Solve for x
   x = 53,959,381.89/8,121.42
6. Step 6: Final answer
   x = 6,644.08