Finding the Fourth Proportional to 21,162.89, 29,203.74 and 12,213.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,162.89 : 29,203.74 = 12,213.24 : x
2. Step 2: Convert to fraction form
   21,162.89/29,203.74 = 12,213.24/x
3. Step 3: Cross multiply
   21,162.89x = 29,203.74 × 12,213.24
4. Step 4: Simplify right side
   21,162.89x = 356,672,285.52
5. Step 5: Solve for x
   x = 356,672,285.52/21,162.89
6. Step 6: Final answer
   x = 16,853.67