Finding the Fourth Proportional to 20,105.78, 27,745.32 and 12,146.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.78 : 27,745.32 = 12,146.62 : x
2. Step 2: Convert to fraction form
   20,105.78/27,745.32 = 12,146.62/x
3. Step 3: Cross multiply
   20,105.78x = 27,745.32 × 12,146.62
4. Step 4: Simplify right side
   20,105.78x = 337,011,858.82
5. Step 5: Solve for x
   x = 337,011,858.82/20,105.78
6. Step 6: Final answer
   x = 16,761.94