Finding the Fourth Proportional to 21,144.72, 29,180.67 and 11,713.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.72 : 29,180.67 = 11,713.29 : x
2. Step 2: Convert to fraction form
   21,144.72/29,180.67 = 11,713.29/x
3. Step 3: Cross multiply
   21,144.72x = 29,180.67 × 11,713.29
4. Step 4: Simplify right side
   21,144.72x = 341,801,650.10
5. Step 5: Solve for x
   x = 341,801,650.10/21,144.72
6. Step 6: Final answer
   x = 16,164.87