Finding the Fourth Proportional to 12,405.37, 18,608.16 and 3,640.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,405.37 : 18,608.16 = 3,640.43 : x
2. Step 2: Convert to fraction form
   12,405.37/18,608.16 = 3,640.43/x
3. Step 3: Cross multiply
   12,405.37x = 18,608.16 × 3,640.43
4. Step 4: Simplify right side
   12,405.37x = 67,741,703.91
5. Step 5: Solve for x
   x = 67,741,703.91/12,405.37
6. Step 6: Final answer
   x = 5,460.68