Finding the Fourth Proportional to 2,661.79, 3,992.55 and 1,018.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.79 : 3,992.55 = 1,018.21 : x
2. Step 2: Convert to fraction form
   2,661.79/3,992.55 = 1,018.21/x
3. Step 3: Cross multiply
   2,661.79x = 3,992.55 × 1,018.21
4. Step 4: Simplify right side
   2,661.79x = 4,065,240.54
5. Step 5: Solve for x
   x = 4,065,240.54/2,661.79
6. Step 6: Final answer
   x = 1,527.26