Finding the Fourth Proportional to 20,091.78, 27,727.35 and 12,132.42

Step by Step Solution

1. Step 1: Write the proportion equation
   20,091.78 : 27,727.35 = 12,132.42 : x
2. Step 2: Convert to fraction form
   20,091.78/27,727.35 = 12,132.42/x
3. Step 3: Cross multiply
   20,091.78x = 27,727.35 × 12,132.42
4. Step 4: Simplify right side
   20,091.78x = 336,399,855.69
5. Step 5: Solve for x
   x = 336,399,855.69/20,091.78
6. Step 6: Final answer
   x = 16,743.16