Finding the Fourth Proportional to 12,435.21, 18,650.39 and 3,668.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,435.21 : 18,650.39 = 3,668.18 : x
2. Step 2: Convert to fraction form
   12,435.21/18,650.39 = 3,668.18/x
3. Step 3: Cross multiply
   12,435.21x = 18,650.39 × 3,668.18
4. Step 4: Simplify right side
   12,435.21x = 68,412,876.00
5. Step 5: Solve for x
   x = 68,412,876.00/12,435.21
6. Step 6: Final answer
   x = 5,501.55