Finding the Fourth Proportional to 21,669.69, 29,909.61 and 12,243.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,669.69 : 29,909.61 = 12,243.72 : x
2. Step 2: Convert to fraction form
   21,669.69/29,909.61 = 12,243.72/x
3. Step 3: Cross multiply
   21,669.69x = 29,909.61 × 12,243.72
4. Step 4: Simplify right side
   21,669.69x = 366,204,890.15
5. Step 5: Solve for x
   x = 366,204,890.15/21,669.69
6. Step 6: Final answer
   x = 16,899.41