Finding the Fourth Proportional to 20,123.86, 30,161.31 and 8,423.38

Step by Step Solution

1. Step 1: Write the proportion equation
   20,123.86 : 30,161.31 = 8,423.38 : x
2. Step 2: Convert to fraction form
   20,123.86/30,161.31 = 8,423.38/x
3. Step 3: Cross multiply
   20,123.86x = 30,161.31 × 8,423.38
4. Step 4: Simplify right side
   20,123.86x = 254,060,175.43
5. Step 5: Solve for x
   x = 254,060,175.43/20,123.86
6. Step 6: Final answer
   x = 12,624.82