Finding the Fourth Proportional to 2,659.15, 3,990.12 and 1,015.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.15 : 3,990.12 = 1,015.71 : x
2. Step 2: Convert to fraction form
   2,659.15/3,990.12 = 1,015.71/x
3. Step 3: Cross multiply
   2,659.15x = 3,990.12 × 1,015.71
4. Step 4: Simplify right side
   2,659.15x = 4,052,804.79
5. Step 5: Solve for x
   x = 4,052,804.79/2,659.15
6. Step 6: Final answer
   x = 1,524.10