Finding the Fourth Proportional to 2,650.82, 3,970.07 and 2,558.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,650.82 : 3,970.07 = 2,558.55 : x
2. Step 2: Convert to fraction form
   2,650.82/3,970.07 = 2,558.55/x
3. Step 3: Cross multiply
   2,650.82x = 3,970.07 × 2,558.55
4. Step 4: Simplify right side
   2,650.82x = 10,157,609.81
5. Step 5: Solve for x
   x = 10,157,609.81/2,650.82
6. Step 6: Final answer
   x = 3,831.88