Finding the Fourth Proportional to 2,164.54, 2,986.85 and 1,280.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.54 : 2,986.85 = 1,280.17 : x
2. Step 2: Convert to fraction form
   2,164.54/2,986.85 = 1,280.17/x
3. Step 3: Cross multiply
   2,164.54x = 2,986.85 × 1,280.17
4. Step 4: Simplify right side
   2,164.54x = 3,823,669.36
5. Step 5: Solve for x
   x = 3,823,669.36/2,164.54
6. Step 6: Final answer
   x = 1,766.50