Finding the Fourth Proportional to 10,811.21, 16,216.38 and 3,416.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,811.21 : 16,216.38 = 3,416.09 : x
2. Step 2: Convert to fraction form
   10,811.21/16,216.38 = 3,416.09/x
3. Step 3: Cross multiply
   10,811.21x = 16,216.38 × 3,416.09
4. Step 4: Simplify right side
   10,811.21x = 55,396,613.55
5. Step 5: Solve for x
   x = 55,396,613.55/10,811.21
6. Step 6: Final answer
   x = 5,124.00