Finding the Fourth Proportional to 12,429.89, 18,640.40 and 4,108.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.89 : 18,640.40 = 4,108.37 : x
2. Step 2: Convert to fraction form
   12,429.89/18,640.40 = 4,108.37/x
3. Step 3: Cross multiply
   12,429.89x = 18,640.40 × 4,108.37
4. Step 4: Simplify right side
   12,429.89x = 76,581,639.61
5. Step 5: Solve for x
   x = 76,581,639.61/12,429.89
6. Step 6: Final answer
   x = 6,161.09