Finding the Fourth Proportional to 2,016.06, 3,022.47 and 861

Step by Step Solution

1. Step 1: Write the proportion equation
   2,016.06 : 3,022.47 = 861 : x
2. Step 2: Convert to fraction form
   2,016.06/3,022.47 = 861/x
3. Step 3: Cross multiply
   2,016.06x = 3,022.47 × 861
4. Step 4: Simplify right side
   2,016.06x = 2,602,346.67
5. Step 5: Solve for x
   x = 2,602,346.67/2,016.06
6. Step 6: Final answer
   x = 1,290.81