Finding the Fourth Proportional to 12,429.79, 18,644.68 and 8,522.35

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.79 : 18,644.68 = 8,522.35 : x
2. Step 2: Convert to fraction form
   12,429.79/18,644.68 = 8,522.35/x
3. Step 3: Cross multiply
   12,429.79x = 18,644.68 × 8,522.35
4. Step 4: Simplify right side
   12,429.79x = 158,896,488.60
5. Step 5: Solve for x
   x = 158,896,488.60/12,429.79
6. Step 6: Final answer
   x = 12,783.52