Finding the Fourth Proportional to 10,885.60, 16,335.68 and 3,960.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,885.60 : 16,335.68 = 3,960.10 : x
2. Step 2: Convert to fraction form
   10,885.60/16,335.68 = 3,960.10/x
3. Step 3: Cross multiply
   10,885.60x = 16,335.68 × 3,960.10
4. Step 4: Simplify right side
   10,885.60x = 64,690,824.89
5. Step 5: Solve for x
   x = 64,690,824.89/10,885.60
6. Step 6: Final answer
   x = 5,942.79