Finding the Fourth Proportional to 20,662.42, 30,992.52 and 12,118.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,662.42 : 30,992.52 = 12,118.62 : x
2. Step 2: Convert to fraction form
   20,662.42/30,992.52 = 12,118.62/x
3. Step 3: Cross multiply
   20,662.42x = 30,992.52 × 12,118.62
4. Step 4: Simplify right side
   20,662.42x = 375,586,572.72
5. Step 5: Solve for x
   x = 375,586,572.72/20,662.42
6. Step 6: Final answer
   x = 18,177.28