Finding the Fourth Proportional to 21,222.59, 29,287.79 and 12,269.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,222.59 : 29,287.79 = 12,269.30 : x
2. Step 2: Convert to fraction form
   21,222.59/29,287.79 = 12,269.30/x
3. Step 3: Cross multiply
   21,222.59x = 29,287.79 × 12,269.30
4. Step 4: Simplify right side
   21,222.59x = 359,340,474.06
5. Step 5: Solve for x
   x = 359,340,474.06/21,222.59
6. Step 6: Final answer
   x = 16,931.98