Finding the Fourth Proportional to 21,105.13, 29,124.72 and 11,673.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,105.13 : 29,124.72 = 11,673.69 : x
2. Step 2: Convert to fraction form
   21,105.13/29,124.72 = 11,673.69/x
3. Step 3: Cross multiply
   21,105.13x = 29,124.72 × 11,673.69
4. Step 4: Simplify right side
   21,105.13x = 339,992,952.62
5. Step 5: Solve for x
   x = 339,992,952.62/21,105.13
6. Step 6: Final answer
   x = 16,109.49