Finding the Fourth Proportional to 21,238.14, 31,817.25 and 12,446.94

Step by Step Solution

1. Step 1: Write the proportion equation
   21,238.14 : 31,817.25 = 12,446.94 : x
2. Step 2: Convert to fraction form
   21,238.14/31,817.25 = 12,446.94/x
3. Step 3: Cross multiply
   21,238.14x = 31,817.25 × 12,446.94
4. Step 4: Simplify right side
   21,238.14x = 396,027,401.72
5. Step 5: Solve for x
   x = 396,027,401.72/21,238.14
6. Step 6: Final answer
   x = 18,646.99