Finding the Fourth Proportional to 2,570.13, 3,854.59 and 721.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.13 : 3,854.59 = 721.42 : x
2. Step 2: Convert to fraction form
   2,570.13/3,854.59 = 721.42/x
3. Step 3: Cross multiply
   2,570.13x = 3,854.59 × 721.42
4. Step 4: Simplify right side
   2,570.13x = 2,780,778.32
5. Step 5: Solve for x
   x = 2,780,778.32/2,570.13
6. Step 6: Final answer
   x = 1,081.96