Finding the Fourth Proportional to 21,091.59, 29,105.15 and 11,659.59

Step by Step Solution

1. Step 1: Write the proportion equation
   21,091.59 : 29,105.15 = 11,659.59 : x
2. Step 2: Convert to fraction form
   21,091.59/29,105.15 = 11,659.59/x
3. Step 3: Cross multiply
   21,091.59x = 29,105.15 × 11,659.59
4. Step 4: Simplify right side
   21,091.59x = 339,354,057.59
5. Step 5: Solve for x
   x = 339,354,057.59/21,091.59
6. Step 6: Final answer
   x = 16,089.54