Finding the Fourth Proportional to 23,709.78, 35,571.15 and 8,128.62

Step by Step Solution

1. Step 1: Write the proportion equation
   23,709.78 : 35,571.15 = 8,128.62 : x
2. Step 2: Convert to fraction form
   23,709.78/35,571.15 = 8,128.62/x
3. Step 3: Cross multiply
   23,709.78x = 35,571.15 × 8,128.62
4. Step 4: Simplify right side
   23,709.78x = 289,144,361.31
5. Step 5: Solve for x
   x = 289,144,361.31/23,709.78
6. Step 6: Final answer
   x = 12,195.15