Finding the Fourth Proportional to 12,429.45, 18,645.03 and 3,664.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.45 : 18,645.03 = 3,664.71 : x
2. Step 2: Convert to fraction form
   12,429.45/18,645.03 = 3,664.71/x
3. Step 3: Cross multiply
   12,429.45x = 18,645.03 × 3,664.71
4. Step 4: Simplify right side
   12,429.45x = 68,328,627.89
5. Step 5: Solve for x
   x = 68,328,627.89/12,429.45
6. Step 6: Final answer
   x = 5,497.32