Finding the Fourth Proportional to 12,641.43, 18,959.27 and 3,408.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,641.43 : 18,959.27 = 3,408.15 : x
2. Step 2: Convert to fraction form
   12,641.43/18,959.27 = 3,408.15/x
3. Step 3: Cross multiply
   12,641.43x = 18,959.27 × 3,408.15
4. Step 4: Simplify right side
   12,641.43x = 64,616,019.01
5. Step 5: Solve for x
   x = 64,616,019.01/12,641.43
6. Step 6: Final answer
   x = 5,111.45