Finding the Fourth Proportional to 20,942.23, 28,898.76 and 12,443.98

Step by Step Solution

1. Step 1: Write the proportion equation
   20,942.23 : 28,898.76 = 12,443.98 : x
2. Step 2: Convert to fraction form
   20,942.23/28,898.76 = 12,443.98/x
3. Step 3: Cross multiply
   20,942.23x = 28,898.76 × 12,443.98
4. Step 4: Simplify right side
   20,942.23x = 359,615,591.46
5. Step 5: Solve for x
   x = 359,615,591.46/20,942.23
6. Step 6: Final answer
   x = 17,171.79