Finding the Fourth Proportional to 2,166.33, 2,989.55 and 1,171.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,166.33 : 2,989.55 = 1,171.61 : x
2. Step 2: Convert to fraction form
   2,166.33/2,989.55 = 1,171.61/x
3. Step 3: Cross multiply
   2,166.33x = 2,989.55 × 1,171.61
4. Step 4: Simplify right side
   2,166.33x = 3,502,586.68
5. Step 5: Solve for x
   x = 3,502,586.68/2,166.33
6. Step 6: Final answer
   x = 1,616.83