Finding the Fourth Proportional to 21,066.78, 29,072.61 and 11,635.98

Step by Step Solution

1. Step 1: Write the proportion equation
   21,066.78 : 29,072.61 = 11,635.98 : x
2. Step 2: Convert to fraction form
   21,066.78/29,072.61 = 11,635.98/x
3. Step 3: Cross multiply
   21,066.78x = 29,072.61 × 11,635.98
4. Step 4: Simplify right side
   21,066.78x = 338,288,308.51
5. Step 5: Solve for x
   x = 338,288,308.51/21,066.78
6. Step 6: Final answer
   x = 16,057.90