Finding the Fourth Proportional to 21,456, 29,609.28 and 12,024.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,456 : 29,609.28 = 12,024.72 : x
2. Step 2: Convert to fraction form
   21,456/29,609.28 = 12,024.72/x
3. Step 3: Cross multiply
   21,456x = 29,609.28 × 12,024.72
4. Step 4: Simplify right side
   21,456x = 356,043,301.40
5. Step 5: Solve for x
   x = 356,043,301.40/21,456
6. Step 6: Final answer
   x = 16,594.11