Finding the Fourth Proportional to 21,179.60, 29,231.72 and 12,225.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,179.60 : 29,231.72 = 12,225.88 : x
2. Step 2: Convert to fraction form
   21,179.60/29,231.72 = 12,225.88/x
3. Step 3: Cross multiply
   21,179.60x = 29,231.72 × 12,225.88
4. Step 4: Simplify right side
   21,179.60x = 357,383,500.91
5. Step 5: Solve for x
   x = 357,383,500.91/21,179.60
6. Step 6: Final answer
   x = 16,873.95