Finding the Fourth Proportional to 21,162.29, 29,199.23 and 12,209.23

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.29 : 29,199.23 = 12,209.23 : x
2. Step 2: Convert to fraction form
   21,162.29/29,199.23 = 12,209.23/x
3. Step 3: Cross multiply
   21,162.29x = 29,199.23 × 12,209.23
4. Step 4: Simplify right side
   21,162.29x = 356,499,968.90
5. Step 5: Solve for x
   x = 356,499,968.90/21,162.29
6. Step 6: Final answer
   x = 16,846.00