Finding the Fourth Proportional to 14,111.72, 21,167.76 and 9,728

Step by Step Solution

1. Step 1: Write the proportion equation
   14,111.72 : 21,167.76 = 9,728 : x
2. Step 2: Convert to fraction form
   14,111.72/21,167.76 = 9,728/x
3. Step 3: Cross multiply
   14,111.72x = 21,167.76 × 9,728
4. Step 4: Simplify right side
   14,111.72x = 205,919,969.28
5. Step 5: Solve for x
   x = 205,919,969.28/14,111.72
6. Step 6: Final answer
   x = 14,592.12