Finding the Fourth Proportional to 8,238.70, 12,365.34 and 7,786.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,238.70 : 12,365.34 = 7,786.72 : x
2. Step 2: Convert to fraction form
   8,238.70/12,365.34 = 7,786.72/x
3. Step 3: Cross multiply
   8,238.70x = 12,365.34 × 7,786.72
4. Step 4: Simplify right side
   8,238.70x = 96,285,440.28
5. Step 5: Solve for x
   x = 96,285,440.28/8,238.70
6. Step 6: Final answer
   x = 11,686.97