Finding the Fourth Proportional to 21,096.43, 31,648.28 and 8,623.24

Step by Step Solution

1. Step 1: Write the proportion equation
   21,096.43 : 31,648.28 = 8,623.24 : x
2. Step 2: Convert to fraction form
   21,096.43/31,648.28 = 8,623.24/x
3. Step 3: Cross multiply
   21,096.43x = 31,648.28 × 8,623.24
4. Step 4: Simplify right side
   21,096.43x = 272,910,714.03
5. Step 5: Solve for x
   x = 272,910,714.03/21,096.43
6. Step 6: Final answer
   x = 12,936.35