Finding the Fourth Proportional to 2,570.43, 3,856.29 and 721.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.43 : 3,856.29 = 721.56 : x
2. Step 2: Convert to fraction form
   2,570.43/3,856.29 = 721.56/x
3. Step 3: Cross multiply
   2,570.43x = 3,856.29 × 721.56
4. Step 4: Simplify right side
   2,570.43x = 2,782,544.61
5. Step 5: Solve for x
   x = 2,782,544.61/2,570.43
6. Step 6: Final answer
   x = 1,082.52