Finding the Fourth Proportional to 21,998.27, 30,354.71 and 12,439.46

Step by Step Solution

1. Step 1: Write the proportion equation
   21,998.27 : 30,354.71 = 12,439.46 : x
2. Step 2: Convert to fraction form
   21,998.27/30,354.71 = 12,439.46/x
3. Step 3: Cross multiply
   21,998.27x = 30,354.71 × 12,439.46
4. Step 4: Simplify right side
   21,998.27x = 377,596,200.86
5. Step 5: Solve for x
   x = 377,596,200.86/21,998.27
6. Step 6: Final answer
   x = 17,164.81