Finding the Fourth Proportional to 2,661.81, 3,992.53 and 1,018.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.81 : 3,992.53 = 1,018.53 : x
2. Step 2: Convert to fraction form
   2,661.81/3,992.53 = 1,018.53/x
3. Step 3: Cross multiply
   2,661.81x = 3,992.53 × 1,018.53
4. Step 4: Simplify right side
   2,661.81x = 4,066,511.58
5. Step 5: Solve for x
   x = 4,066,511.58/2,661.81
6. Step 6: Final answer
   x = 1,527.72