Finding the Fourth Proportional to 2,164.01, 2,986.94 and 1,280.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.01 : 2,986.94 = 1,280.12 : x
2. Step 2: Convert to fraction form
   2,164.01/2,986.94 = 1,280.12/x
3. Step 3: Cross multiply
   2,164.01x = 2,986.94 × 1,280.12
4. Step 4: Simplify right side
   2,164.01x = 3,823,632.03
5. Step 5: Solve for x
   x = 3,823,632.03/2,164.01
6. Step 6: Final answer
   x = 1,766.92