Finding the Fourth Proportional to 12,429.54, 18,644.30 and 8,522.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.54 : 18,644.30 = 8,522.10 : x
2. Step 2: Convert to fraction form
   12,429.54/18,644.30 = 8,522.10/x
3. Step 3: Cross multiply
   12,429.54x = 18,644.30 × 8,522.10
4. Step 4: Simplify right side
   12,429.54x = 158,888,589.03
5. Step 5: Solve for x
   x = 158,888,589.03/12,429.54
6. Step 6: Final answer
   x = 12,783.14