Finding the Fourth Proportional to 19,819.53, 29,709.15 and 12,429.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,819.53 : 29,709.15 = 12,429.15 : x
2. Step 2: Convert to fraction form
   19,819.53/29,709.15 = 12,429.15/x
3. Step 3: Cross multiply
   19,819.53x = 29,709.15 × 12,429.15
4. Step 4: Simplify right side
   19,819.53x = 369,259,481.72
5. Step 5: Solve for x
   x = 369,259,481.72/19,819.53
6. Step 6: Final answer
   x = 18,631.09