Finding the Fourth Proportional to 12,403.12, 18,604.78 and 3,638.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,403.12 : 18,604.78 = 3,638.18 : x
2. Step 2: Convert to fraction form
   12,403.12/18,604.78 = 3,638.18/x
3. Step 3: Cross multiply
   12,403.12x = 18,604.78 × 3,638.18
4. Step 4: Simplify right side
   12,403.12x = 67,687,436.38
5. Step 5: Solve for x
   x = 67,687,436.38/12,403.12
6. Step 6: Final answer
   x = 5,457.29