Finding the Fourth Proportional to 2,661.56, 3,990.72 and 1,018.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.56 : 3,990.72 = 1,018.22 : x
2. Step 2: Convert to fraction form
   2,661.56/3,990.72 = 1,018.22/x
3. Step 3: Cross multiply
   2,661.56x = 3,990.72 × 1,018.22
4. Step 4: Simplify right side
   2,661.56x = 4,063,430.92
5. Step 5: Solve for x
   x = 4,063,430.92/2,661.56
6. Step 6: Final answer
   x = 1,526.71