Finding the Fourth Proportional to 10,816.11, 16,218.45 and 5,111.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,816.11 : 16,218.45 = 5,111.10 : x
2. Step 2: Convert to fraction form
   10,816.11/16,218.45 = 5,111.10/x
3. Step 3: Cross multiply
   10,816.11x = 16,218.45 × 5,111.10
4. Step 4: Simplify right side
   10,816.11x = 82,894,119.80
5. Step 5: Solve for x
   x = 82,894,119.80/10,816.11
6. Step 6: Final answer
   x = 7,663.95