Finding the Fourth Proportional to 4,820.28, 7,224.80 and 2,217.72

Step by Step Solution

1. Step 1: Write the proportion equation
   4,820.28 : 7,224.80 = 2,217.72 : x
2. Step 2: Convert to fraction form
   4,820.28/7,224.80 = 2,217.72/x
3. Step 3: Cross multiply
   4,820.28x = 7,224.80 × 2,217.72
4. Step 4: Simplify right side
   4,820.28x = 16,022,583.46
5. Step 5: Solve for x
   x = 16,022,583.46/4,820.28
6. Step 6: Final answer
   x = 3,323.99