Finding the Fourth Proportional to 12,406.50, 17,121.78 and 7,693.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,406.50 : 17,121.78 = 7,693.92 : x
2. Step 2: Convert to fraction form
   12,406.50/17,121.78 = 7,693.92/x
3. Step 3: Cross multiply
   12,406.50x = 17,121.78 × 7,693.92
4. Step 4: Simplify right side
   12,406.50x = 131,733,605.58
5. Step 5: Solve for x
   x = 131,733,605.58/12,406.50
6. Step 6: Final answer
   x = 10,618.11