Finding the Fourth Proportional to 10,885.62, 16,335.69 and 3,960.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,885.62 : 16,335.69 = 3,960.12 : x
2. Step 2: Convert to fraction form
   10,885.62/16,335.69 = 3,960.12/x
3. Step 3: Cross multiply
   10,885.62x = 16,335.69 × 3,960.12
4. Step 4: Simplify right side
   10,885.62x = 64,691,211.00
5. Step 5: Solve for x
   x = 64,691,211.00/10,885.62
6. Step 6: Final answer
   x = 5,942.82