Finding the Fourth Proportional to 10,816.42, 16,216.96 and 4,809.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,816.42 : 16,216.96 = 4,809.21 : x
2. Step 2: Convert to fraction form
   10,816.42/16,216.96 = 4,809.21/x
3. Step 3: Cross multiply
   10,816.42x = 16,216.96 × 4,809.21
4. Step 4: Simplify right side
   10,816.42x = 77,990,702.38
5. Step 5: Solve for x
   x = 77,990,702.38/10,816.42
6. Step 6: Final answer
   x = 7,210.40