Finding the Fourth Proportional to 21,650.14, 29,879.94 and 12,218.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,650.14 : 29,879.94 = 12,218.50 : x
2. Step 2: Convert to fraction form
   21,650.14/29,879.94 = 12,218.50/x
3. Step 3: Cross multiply
   21,650.14x = 29,879.94 × 12,218.50
4. Step 4: Simplify right side
   21,650.14x = 365,088,046.89
5. Step 5: Solve for x
   x = 365,088,046.89/21,650.14
6. Step 6: Final answer
   x = 16,863.08