Finding the Fourth Proportional to 2,660.22, 3,990.61 and 1,018.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.22 : 3,990.61 = 1,018.15 : x
2. Step 2: Convert to fraction form
   2,660.22/3,990.61 = 1,018.15/x
3. Step 3: Cross multiply
   2,660.22x = 3,990.61 × 1,018.15
4. Step 4: Simplify right side
   2,660.22x = 4,063,039.57
5. Step 5: Solve for x
   x = 4,063,039.57/2,660.22
6. Step 6: Final answer
   x = 1,527.33