Finding the Fourth Proportional to 21,676.02, 29,912.52 and 12,115.29

Step by Step Solution

1. Step 1: Write the proportion equation
   21,676.02 : 29,912.52 = 12,115.29 : x
2. Step 2: Convert to fraction form
   21,676.02/29,912.52 = 12,115.29/x
3. Step 3: Cross multiply
   21,676.02x = 29,912.52 × 12,115.29
4. Step 4: Simplify right side
   21,676.02x = 362,398,854.43
5. Step 5: Solve for x
   x = 362,398,854.43/21,676.02
6. Step 6: Final answer
   x = 16,718.88