Finding the Fourth Proportional to 12,640.41, 18,958.46 and 3,404.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.41 : 18,958.46 = 3,404.25 : x
2. Step 2: Convert to fraction form
   12,640.41/18,958.46 = 3,404.25/x
3. Step 3: Cross multiply
   12,640.41x = 18,958.46 × 3,404.25
4. Step 4: Simplify right side
   12,640.41x = 64,539,320.43
5. Step 5: Solve for x
   x = 64,539,320.43/12,640.41
6. Step 6: Final answer
   x = 5,105.79