Finding the Fourth Proportional to 20,105.56, 27,744.42 and 12,143.08

Step by Step Solution

1. Step 1: Write the proportion equation
   20,105.56 : 27,744.42 = 12,143.08 : x
2. Step 2: Convert to fraction form
   20,105.56/27,744.42 = 12,143.08/x
3. Step 3: Cross multiply
   20,105.56x = 27,744.42 × 12,143.08
4. Step 4: Simplify right side
   20,105.56x = 336,902,711.61
5. Step 5: Solve for x
   x = 336,902,711.61/20,105.56
6. Step 6: Final answer
   x = 16,756.69