Finding the Fourth Proportional to 3,499.28, 4,828.72 and 2,172.73

Step by Step Solution

1. Step 1: Write the proportion equation
   3,499.28 : 4,828.72 = 2,172.73 : x
2. Step 2: Convert to fraction form
   3,499.28/4,828.72 = 2,172.73/x
3. Step 3: Cross multiply
   3,499.28x = 4,828.72 × 2,172.73
4. Step 4: Simplify right side
   3,499.28x = 10,491,469.80
5. Step 5: Solve for x
   x = 10,491,469.80/3,499.28
6. Step 6: Final answer
   x = 2,998.18