Finding the Fourth Proportional to 20,359.98, 30,503.70 and 12,458.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,359.98 : 30,503.70 = 12,458.62 : x
2. Step 2: Convert to fraction form
   20,359.98/30,503.70 = 12,458.62/x
3. Step 3: Cross multiply
   20,359.98x = 30,503.70 × 12,458.62
4. Step 4: Simplify right side
   20,359.98x = 380,034,006.89
5. Step 5: Solve for x
   x = 380,034,006.89/20,359.98
6. Step 6: Final answer
   x = 18,665.74