Finding the Fourth Proportional to 11,945.46, 16,485.15 and 6,640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.46 : 16,485.15 = 6,640.50 : x
2. Step 2: Convert to fraction form
   11,945.46/16,485.15 = 6,640.50/x
3. Step 3: Cross multiply
   11,945.46x = 16,485.15 × 6,640.50
4. Step 4: Simplify right side
   11,945.46x = 109,469,638.58
5. Step 5: Solve for x
   x = 109,469,638.58/11,945.46
6. Step 6: Final answer
   x = 9,164.12