Finding the Fourth Proportional to 10,768.72, 14,842.56 and 8,215.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,768.72 : 14,842.56 = 8,215.60 : x
2. Step 2: Convert to fraction form
   10,768.72/14,842.56 = 8,215.60/x
3. Step 3: Cross multiply
   10,768.72x = 14,842.56 × 8,215.60
4. Step 4: Simplify right side
   10,768.72x = 121,940,535.94
5. Step 5: Solve for x
   x = 121,940,535.94/10,768.72
6. Step 6: Final answer
   x = 11,323.59