Finding the Fourth Proportional to 12,118.52, 16,721.72 and 6,812.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,118.52 : 16,721.72 = 6,812.31 : x
2. Step 2: Convert to fraction form
   12,118.52/16,721.72 = 6,812.31/x
3. Step 3: Cross multiply
   12,118.52x = 16,721.72 × 6,812.31
4. Step 4: Simplify right side
   12,118.52x = 113,913,469.15
5. Step 5: Solve for x
   x = 113,913,469.15/12,118.52
6. Step 6: Final answer
   x = 9,399.95