Finding the Fourth Proportional to 20,182.10, 30,215.55 and 12,406.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,182.10 : 30,215.55 = 12,406.10 : x
2. Step 2: Convert to fraction form
   20,182.10/30,215.55 = 12,406.10/x
3. Step 3: Cross multiply
   20,182.10x = 30,215.55 × 12,406.10
4. Step 4: Simplify right side
   20,182.10x = 374,857,134.86
5. Step 5: Solve for x
   x = 374,857,134.86/20,182.10
6. Step 6: Final answer
   x = 18,573.74