Finding the Fourth Proportional to 8,142.30, 12,229.83 and 7,912.62

Step by Step Solution

1. Step 1: Write the proportion equation
   8,142.30 : 12,229.83 = 7,912.62 : x
2. Step 2: Convert to fraction form
   8,142.30/12,229.83 = 7,912.62/x
3. Step 3: Cross multiply
   8,142.30x = 12,229.83 × 7,912.62
4. Step 4: Simplify right side
   8,142.30x = 96,769,997.45
5. Step 5: Solve for x
   x = 96,769,997.45/8,142.30
6. Step 6: Final answer
   x = 11,884.85