Finding the Fourth Proportional to 12,404.05, 18,606.23 and 3,639.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,404.05 : 18,606.23 = 3,639.15 : x
2. Step 2: Convert to fraction form
   12,404.05/18,606.23 = 3,639.15/x
3. Step 3: Cross multiply
   12,404.05x = 18,606.23 × 3,639.15
4. Step 4: Simplify right side
   12,404.05x = 67,710,861.90
5. Step 5: Solve for x
   x = 67,710,861.90/12,404.05
6. Step 6: Final answer
   x = 5,458.77