Finding the Fourth Proportional to 2,661.90, 3,992.55 and 1,018.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.90 : 3,992.55 = 1,018.41 : x
2. Step 2: Convert to fraction form
   2,661.90/3,992.55 = 1,018.41/x
3. Step 3: Cross multiply
   2,661.90x = 3,992.55 × 1,018.41
4. Step 4: Simplify right side
   2,661.90x = 4,066,052.85
5. Step 5: Solve for x
   x = 4,066,052.85/2,661.90
6. Step 6: Final answer
   x = 1,527.50