Finding the Fourth Proportional to 21,676.82, 29,913.38 and 12,116.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,676.82 : 29,913.38 = 12,116.72 : x
2. Step 2: Convert to fraction form
   21,676.82/29,913.38 = 12,116.72/x
3. Step 3: Cross multiply
   21,676.82x = 29,913.38 × 12,116.72
4. Step 4: Simplify right side
   21,676.82x = 362,452,012.17
5. Step 5: Solve for x
   x = 362,452,012.17/21,676.82
6. Step 6: Final answer
   x = 16,720.72