Finding the Fourth Proportional to 2,659.64, 3,986.72 and 1,015.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.64 : 3,986.72 = 1,015.74 : x
2. Step 2: Convert to fraction form
   2,659.64/3,986.72 = 1,015.74/x
3. Step 3: Cross multiply
   2,659.64x = 3,986.72 × 1,015.74
4. Step 4: Simplify right side
   2,659.64x = 4,049,469.70
5. Step 5: Solve for x
   x = 4,049,469.70/2,659.64
6. Step 6: Final answer
   x = 1,522.57