Finding the Fourth Proportional to 12,429.31, 18,644.55 and 3,664.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.31 : 18,644.55 = 3,664.30 : x
2. Step 2: Convert to fraction form
   12,429.31/18,644.55 = 3,664.30/x
3. Step 3: Cross multiply
   12,429.31x = 18,644.55 × 3,664.30
4. Step 4: Simplify right side
   12,429.31x = 68,319,224.57
5. Step 5: Solve for x
   x = 68,319,224.57/12,429.31
6. Step 6: Final answer
   x = 5,496.62