Finding the Fourth Proportional to 2,570.33, 3,855.59 and 721.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.33 : 3,855.59 = 721.62 : x
2. Step 2: Convert to fraction form
   2,570.33/3,855.59 = 721.62/x
3. Step 3: Cross multiply
   2,570.33x = 3,855.59 × 721.62
4. Step 4: Simplify right side
   2,570.33x = 2,782,270.86
5. Step 5: Solve for x
   x = 2,782,270.86/2,570.33
6. Step 6: Final answer
   x = 1,082.46