Finding the Fourth Proportional to 14,015.72, 19,340.78 and 7,728.10

Step by Step Solution

1. Step 1: Write the proportion equation
   14,015.72 : 19,340.78 = 7,728.10 : x
2. Step 2: Convert to fraction form
   14,015.72/19,340.78 = 7,728.10/x
3. Step 3: Cross multiply
   14,015.72x = 19,340.78 × 7,728.10
4. Step 4: Simplify right side
   14,015.72x = 149,467,481.92
5. Step 5: Solve for x
   x = 149,467,481.92/14,015.72
6. Step 6: Final answer
   x = 10,664.27