Finding the Fourth Proportional to 2,580.67, 3,871.22 and 825.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.67 : 3,871.22 = 825.91 : x
2. Step 2: Convert to fraction form
   2,580.67/3,871.22 = 825.91/x
3. Step 3: Cross multiply
   2,580.67x = 3,871.22 × 825.91
4. Step 4: Simplify right side
   2,580.67x = 3,197,279.31
5. Step 5: Solve for x
   x = 3,197,279.31/2,580.67
6. Step 6: Final answer
   x = 1,238.93