Finding the Fourth Proportional to 2,209.82, 3,311.63 and 1,661.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.82 : 3,311.63 = 1,661.36 : x
2. Step 2: Convert to fraction form
   2,209.82/3,311.63 = 1,661.36/x
3. Step 3: Cross multiply
   2,209.82x = 3,311.63 × 1,661.36
4. Step 4: Simplify right side
   2,209.82x = 5,501,790.98
5. Step 5: Solve for x
   x = 5,501,790.98/2,209.82
6. Step 6: Final answer
   x = 2,489.71