Finding the Fourth Proportional to 12,209.67, 16,819.21 and 10,411.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.67 : 16,819.21 = 10,411.29 : x
2. Step 2: Convert to fraction form
   12,209.67/16,819.21 = 10,411.29/x
3. Step 3: Cross multiply
   12,209.67x = 16,819.21 × 10,411.29
4. Step 4: Simplify right side
   12,209.67x = 175,109,672.88
5. Step 5: Solve for x
   x = 175,109,672.88/12,209.67
6. Step 6: Final answer
   x = 14,341.88