Finding the Fourth Proportional to 8,328.86, 12,400.83 and 8,212.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,328.86 : 12,400.83 = 8,212.62 : x
2. Step 2: Convert to fraction form
   8,328.86/12,400.83 = 8,212.62/x
3. Step 3: Cross multiply
   8,328.86x = 12,400.83 × 8,212.62
4. Step 4: Simplify right side
   8,328.86x = 101,843,304.47
5. Step 5: Solve for x
   x = 101,843,304.47/8,328.86
6. Step 6: Final answer
   x = 12,227.76