Finding the Fourth Proportional to 2,164.59, 2,986.67 and 1,280.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.59 : 2,986.67 = 1,280.68 : x
2. Step 2: Convert to fraction form
   2,164.59/2,986.67 = 1,280.68/x
3. Step 3: Cross multiply
   2,164.59x = 2,986.67 × 1,280.68
4. Step 4: Simplify right side
   2,164.59x = 3,824,964.27
5. Step 5: Solve for x
   x = 3,824,964.27/2,164.59
6. Step 6: Final answer
   x = 1,767.06