Finding the Fourth Proportional to 21,156.48, 31,734.63 and 12,446.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,156.48 : 31,734.63 = 12,446.82 : x
2. Step 2: Convert to fraction form
   21,156.48/31,734.63 = 12,446.82/x
3. Step 3: Cross multiply
   21,156.48x = 31,734.63 × 12,446.82
4. Step 4: Simplify right side
   21,156.48x = 394,995,227.38
5. Step 5: Solve for x
   x = 394,995,227.38/21,156.48
6. Step 6: Final answer
   x = 18,670.18