Finding the Fourth Proportional to 12,429.55, 18,644.31 and 8,522.11

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.55 : 18,644.31 = 8,522.11 : x
2. Step 2: Convert to fraction form
   12,429.55/18,644.31 = 8,522.11/x
3. Step 3: Cross multiply
   12,429.55x = 18,644.31 × 8,522.11
4. Step 4: Simplify right side
   12,429.55x = 158,888,860.69
5. Step 5: Solve for x
   x = 158,888,860.69/12,429.55
6. Step 6: Final answer
   x = 12,783.15