Finding the Fourth Proportional to 21,109.76, 29,128.02 and 11,676.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,109.76 : 29,128.02 = 11,676.52 : x
2. Step 2: Convert to fraction form
   21,109.76/29,128.02 = 11,676.52/x
3. Step 3: Cross multiply
   21,109.76x = 29,128.02 × 11,676.52
4. Step 4: Simplify right side
   21,109.76x = 340,113,908.09
5. Step 5: Solve for x
   x = 340,113,908.09/21,109.76
6. Step 6: Final answer
   x = 16,111.69