Finding the Fourth Proportional to 21,087.73, 29,100.67 and 11,656.09

Step by Step Solution

1. Step 1: Write the proportion equation
   21,087.73 : 29,100.67 = 11,656.09 : x
2. Step 2: Convert to fraction form
   21,087.73/29,100.67 = 11,656.09/x
3. Step 3: Cross multiply
   21,087.73x = 29,100.67 × 11,656.09
4. Step 4: Simplify right side
   21,087.73x = 339,200,028.58
5. Step 5: Solve for x
   x = 339,200,028.58/21,087.73
6. Step 6: Final answer
   x = 16,085.18