Finding the Fourth Proportional to 12,640.50, 17,450.37 and 7,929.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,640.50 : 17,450.37 = 7,929.54 : x
2. Step 2: Convert to fraction form
   12,640.50/17,450.37 = 7,929.54/x
3. Step 3: Cross multiply
   12,640.50x = 17,450.37 × 7,929.54
4. Step 4: Simplify right side
   12,640.50x = 138,373,406.93
5. Step 5: Solve for x
   x = 138,373,406.93/12,640.50
6. Step 6: Final answer
   x = 10,946.83