Finding the Fourth Proportional to 2,570.00, 3,854.45 and 721.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,570.00 : 3,854.45 = 721.31 : x
2. Step 2: Convert to fraction form
   2,570.00/3,854.45 = 721.31/x
3. Step 3: Cross multiply
   2,570.00x = 3,854.45 × 721.31
4. Step 4: Simplify right side
   2,570.00x = 2,780,235.86
5. Step 5: Solve for x
   x = 2,780,235.86/2,570.00
6. Step 6: Final answer
   x = 1,081.81