Finding the Fourth Proportional to 10,885.59, 16,335.67 and 3,960.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,885.59 : 16,335.67 = 3,960.09 : x
2. Step 2: Convert to fraction form
   10,885.59/16,335.67 = 3,960.09/x
3. Step 3: Cross multiply
   10,885.59x = 16,335.67 × 3,960.09
4. Step 4: Simplify right side
   10,885.59x = 64,690,723.41
5. Step 5: Solve for x
   x = 64,690,723.41/10,885.59
6. Step 6: Final answer
   x = 5,942.79