Finding the Fourth Proportional to 21,234.96, 31,842.72 and 12,474

Step by Step Solution

1. Step 1: Write the proportion equation
   21,234.96 : 31,842.72 = 12,474 : x
2. Step 2: Convert to fraction form
   21,234.96/31,842.72 = 12,474/x
3. Step 3: Cross multiply
   21,234.96x = 31,842.72 × 12,474
4. Step 4: Simplify right side
   21,234.96x = 397,206,089.28
5. Step 5: Solve for x
   x = 397,206,089.28/21,234.96
6. Step 6: Final answer
   x = 18,705.29