Finding the Fourth Proportional to 11,945.54, 16,484.76 and 6,640.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,945.54 : 16,484.76 = 6,640.31 : x
2. Step 2: Convert to fraction form
   11,945.54/16,484.76 = 6,640.31/x
3. Step 3: Cross multiply
   11,945.54x = 16,484.76 × 6,640.31
4. Step 4: Simplify right side
   11,945.54x = 109,463,957.89
5. Step 5: Solve for x
   x = 109,463,957.89/11,945.54
6. Step 6: Final answer
   x = 9,163.58