Finding the Fourth Proportional to 10,857.15, 16,286.91 and 3,459.89

Step by Step Solution

1. Step 1: Write the proportion equation
   10,857.15 : 16,286.91 = 3,459.89 : x
2. Step 2: Convert to fraction form
   10,857.15/16,286.91 = 3,459.89/x
3. Step 3: Cross multiply
   10,857.15x = 16,286.91 × 3,459.89
4. Step 4: Simplify right side
   10,857.15x = 56,350,835.61
5. Step 5: Solve for x
   x = 56,350,835.61/10,857.15
6. Step 6: Final answer
   x = 5,190.21