Finding the Fourth Proportional to 2,660.07, 3,991.76 and 1,016.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.07 : 3,991.76 = 1,016.79 : x
2. Step 2: Convert to fraction form
   2,660.07/3,991.76 = 1,016.79/x
3. Step 3: Cross multiply
   2,660.07x = 3,991.76 × 1,016.79
4. Step 4: Simplify right side
   2,660.07x = 4,058,781.65
5. Step 5: Solve for x
   x = 4,058,781.65/2,660.07
6. Step 6: Final answer
   x = 1,525.82