Finding the Fourth Proportional to 10,811.54, 16,218.89 and 3,416.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,811.54 : 16,218.89 = 3,416.55 : x
2. Step 2: Convert to fraction form
   10,811.54/16,218.89 = 3,416.55/x
3. Step 3: Cross multiply
   10,811.54x = 16,218.89 × 3,416.55
4. Step 4: Simplify right side
   10,811.54x = 55,412,631.55
5. Step 5: Solve for x
   x = 55,412,631.55/10,811.54
6. Step 6: Final answer
   x = 5,125.33