Finding the Fourth Proportional to 2,164.07, 2,986.33 and 1,206.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.07 : 2,986.33 = 1,206.96 : x
2. Step 2: Convert to fraction form
   2,164.07/2,986.33 = 1,206.96/x
3. Step 3: Cross multiply
   2,164.07x = 2,986.33 × 1,206.96
4. Step 4: Simplify right side
   2,164.07x = 3,604,380.86
5. Step 5: Solve for x
   x = 3,604,380.86/2,164.07
6. Step 6: Final answer
   x = 1,665.56