Finding the Fourth Proportional to 2,661.23, 3,992.12 and 1,019.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.23 : 3,992.12 = 1,019.15 : x
2. Step 2: Convert to fraction form
   2,661.23/3,992.12 = 1,019.15/x
3. Step 3: Cross multiply
   2,661.23x = 3,992.12 × 1,019.15
4. Step 4: Simplify right side
   2,661.23x = 4,068,544.04
5. Step 5: Solve for x
   x = 4,068,544.04/2,661.23
6. Step 6: Final answer
   x = 1,528.82