Finding the Fourth Proportional to 21,158.13, 29,198.00 and 12,205.53

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.13 : 29,198.00 = 12,205.53 : x
2. Step 2: Convert to fraction form
   21,158.13/29,198.00 = 12,205.53/x
3. Step 3: Cross multiply
   21,158.13x = 29,198.00 × 12,205.53
4. Step 4: Simplify right side
   21,158.13x = 356,377,003.91
5. Step 5: Solve for x
   x = 356,377,003.91/21,158.13
6. Step 6: Final answer
   x = 16,843.50