Finding the Fourth Proportional to 2,581.87, 3,873.06 and 826.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,581.87 : 3,873.06 = 826.43 : x
2. Step 2: Convert to fraction form
   2,581.87/3,873.06 = 826.43/x
3. Step 3: Cross multiply
   2,581.87x = 3,873.06 × 826.43
4. Step 4: Simplify right side
   2,581.87x = 3,200,822.66
5. Step 5: Solve for x
   x = 3,200,822.66/2,581.87
6. Step 6: Final answer
   x = 1,239.73