Finding the Fourth Proportional to 7,200.77, 10,800.24 and 2,821.30

Step by Step Solution

1. Step 1: Write the proportion equation
   7,200.77 : 10,800.24 = 2,821.30 : x
2. Step 2: Convert to fraction form
   7,200.77/10,800.24 = 2,821.30/x
3. Step 3: Cross multiply
   7,200.77x = 10,800.24 × 2,821.30
4. Step 4: Simplify right side
   7,200.77x = 30,470,679.53
5. Step 5: Solve for x
   x = 30,470,679.53/7,200.77
6. Step 6: Final answer
   x = 4,231.59