Finding the Fourth Proportional to 21,617.98, 29,834.77 and 13,122.27

Step by Step Solution

1. Step 1: Write the proportion equation
   21,617.98 : 29,834.77 = 13,122.27 : x
2. Step 2: Convert to fraction form
   21,617.98/29,834.77 = 13,122.27/x
3. Step 3: Cross multiply
   21,617.98x = 29,834.77 × 13,122.27
4. Step 4: Simplify right side
   21,617.98x = 391,499,907.33
5. Step 5: Solve for x
   x = 391,499,907.33/21,617.98
6. Step 6: Final answer
   x = 18,109.92