Finding the Fourth Proportional to 2,660.50, 3,990.21 and 1,016.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,660.50 : 3,990.21 = 1,016.47 : x
2. Step 2: Convert to fraction form
   2,660.50/3,990.21 = 1,016.47/x
3. Step 3: Cross multiply
   2,660.50x = 3,990.21 × 1,016.47
4. Step 4: Simplify right side
   2,660.50x = 4,055,928.76
5. Step 5: Solve for x
   x = 4,055,928.76/2,660.50
6. Step 6: Final answer
   x = 1,524.50