Finding the Fourth Proportional to 21,529.86, 29,711.82 and 12,099.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,529.86 : 29,711.82 = 12,099.30 : x
2. Step 2: Convert to fraction form
   21,529.86/29,711.82 = 12,099.30/x
3. Step 3: Cross multiply
   21,529.86x = 29,711.82 × 12,099.30
4. Step 4: Simplify right side
   21,529.86x = 359,492,223.73
5. Step 5: Solve for x
   x = 359,492,223.73/21,529.86
6. Step 6: Final answer
   x = 16,697.38