Finding the Fourth Proportional to 21,337.84, 31,944.78 and 12,426

Step by Step Solution

1. Step 1: Write the proportion equation
   21,337.84 : 31,944.78 = 12,426 : x
2. Step 2: Convert to fraction form
   21,337.84/31,944.78 = 12,426/x
3. Step 3: Cross multiply
   21,337.84x = 31,944.78 × 12,426
4. Step 4: Simplify right side
   21,337.84x = 396,945,836.28
5. Step 5: Solve for x
   x = 396,945,836.28/21,337.84
6. Step 6: Final answer
   x = 18,602.91