Finding the Fourth Proportional to 10,816.21, 16,218.51 and 5,549.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,816.21 : 16,218.51 = 5,549.05 : x
2. Step 2: Convert to fraction form
   10,816.21/16,218.51 = 5,549.05/x
3. Step 3: Cross multiply
   10,816.21x = 16,218.51 × 5,549.05
4. Step 4: Simplify right side
   10,816.21x = 89,997,322.92
5. Step 5: Solve for x
   x = 89,997,322.92/10,816.21
6. Step 6: Final answer
   x = 8,320.60