Finding the Fourth Proportional to 12,408.48, 18,615.86 and 3,643.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,408.48 : 18,615.86 = 3,643.40 : x
2. Step 2: Convert to fraction form
   12,408.48/18,615.86 = 3,643.40/x
3. Step 3: Cross multiply
   12,408.48x = 18,615.86 × 3,643.40
4. Step 4: Simplify right side
   12,408.48x = 67,824,913.03
5. Step 5: Solve for x
   x = 67,824,913.03/12,408.48
6. Step 6: Final answer
   x = 5,466.01