Finding the Fourth Proportional to 21,061.12, 29,065.68 and 11,629.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.12 : 29,065.68 = 11,629.72 : x
2. Step 2: Convert to fraction form
   21,061.12/29,065.68 = 11,629.72/x
3. Step 3: Cross multiply
   21,061.12x = 29,065.68 × 11,629.72
4. Step 4: Simplify right side
   21,061.12x = 338,025,720.01
5. Step 5: Solve for x
   x = 338,025,720.01/21,061.12
6. Step 6: Final answer
   x = 16,049.75