Finding the Fourth Proportional to 21,669.86, 29,905.05 and 12,109.43

Step by Step Solution

1. Step 1: Write the proportion equation
   21,669.86 : 29,905.05 = 12,109.43 : x
2. Step 2: Convert to fraction form
   21,669.86/29,905.05 = 12,109.43/x
3. Step 3: Cross multiply
   21,669.86x = 29,905.05 × 12,109.43
4. Step 4: Simplify right side
   21,669.86x = 362,132,960.10
5. Step 5: Solve for x
   x = 362,132,960.10/21,669.86
6. Step 6: Final answer
   x = 16,711.37