Finding the Fourth Proportional to 20,105.29, 30,115.41 and 12,705.94

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.29 : 30,115.41 = 12,705.94 : x
2. Step 2: Convert to fraction form
   20,105.29/30,115.41 = 12,705.94/x
3. Step 3: Cross multiply
   20,105.29x = 30,115.41 × 12,705.94
4. Step 4: Simplify right side
   20,105.29x = 382,644,592.54
5. Step 5: Solve for x
   x = 382,644,592.54/20,105.29
6. Step 6: Final answer
   x = 19,032.04