Finding the Fourth Proportional to 12,644.32, 18,963.92 and 3,408.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.32 : 18,963.92 = 3,408.16 : x
2. Step 2: Convert to fraction form
   12,644.32/18,963.92 = 3,408.16/x
3. Step 3: Cross multiply
   12,644.32x = 18,963.92 × 3,408.16
4. Step 4: Simplify right side
   12,644.32x = 64,632,073.59
5. Step 5: Solve for x
   x = 64,632,073.59/12,644.32
6. Step 6: Final answer
   x = 5,111.55