Finding the Fourth Proportional to 2,108.24, 3,162.49 and 721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.24 : 3,162.49 = 721.72 : x
2. Step 2: Convert to fraction form
   2,108.24/3,162.49 = 721.72/x
3. Step 3: Cross multiply
   2,108.24x = 3,162.49 × 721.72
4. Step 4: Simplify right side
   2,108.24x = 2,282,422.57
5. Step 5: Solve for x
   x = 2,282,422.57/2,108.24
6. Step 6: Final answer
   x = 1,082.62