Finding the Fourth Proportional to 21,081.78, 29,091.72 and 11,649.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,081.78 : 29,091.72 = 11,649.78 : x
2. Step 2: Convert to fraction form
   21,081.78/29,091.72 = 11,649.78/x
3. Step 3: Cross multiply
   21,081.78x = 29,091.72 × 11,649.78
4. Step 4: Simplify right side
   21,081.78x = 338,912,137.82
5. Step 5: Solve for x
   x = 338,912,137.82/21,081.78
6. Step 6: Final answer
   x = 16,076.07