Finding the Fourth Proportional to 12,406.83, 18,608.28 and 3,639.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.83 : 18,608.28 = 3,639.69 : x
2. Step 2: Convert to fraction form
   12,406.83/18,608.28 = 3,639.69/x
3. Step 3: Cross multiply
   12,406.83x = 18,608.28 × 3,639.69
4. Step 4: Simplify right side
   12,406.83x = 67,728,370.63
5. Step 5: Solve for x
   x = 67,728,370.63/12,406.83
6. Step 6: Final answer
   x = 5,458.96