Finding the Fourth Proportional to 16,238.78, 22,410.83 and 12,909.07

Step by Step Solution

1. Step 1: Write the proportion equation
   16,238.78 : 22,410.83 = 12,909.07 : x
2. Step 2: Convert to fraction form
   16,238.78/22,410.83 = 12,909.07/x
3. Step 3: Cross multiply
   16,238.78x = 22,410.83 × 12,909.07
4. Step 4: Simplify right side
   16,238.78x = 289,302,960.90
5. Step 5: Solve for x
   x = 289,302,960.90/16,238.78
6. Step 6: Final answer
   x = 17,815.56