Finding the Fourth Proportional to 2,660.64, 3,991.86 and 1,017.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.64 : 3,991.86 = 1,017.42 : x
2. Step 2: Convert to fraction form
   2,660.64/3,991.86 = 1,017.42/x
3. Step 3: Cross multiply
   2,660.64x = 3,991.86 × 1,017.42
4. Step 4: Simplify right side
   2,660.64x = 4,061,398.20
5. Step 5: Solve for x
   x = 4,061,398.20/2,660.64
6. Step 6: Final answer
   x = 1,526.47