Finding the Fourth Proportional to 13,105.43, 19,563.12 and 12,129.82

Step by Step Solution

1. Step 1: Write the proportion equation
   13,105.43 : 19,563.12 = 12,129.82 : x
2. Step 2: Convert to fraction form
   13,105.43/19,563.12 = 12,129.82/x
3. Step 3: Cross multiply
   13,105.43x = 19,563.12 × 12,129.82
4. Step 4: Simplify right side
   13,105.43x = 237,297,123.38
5. Step 5: Solve for x
   x = 237,297,123.38/13,105.43
6. Step 6: Final answer
   x = 18,106.79