Finding the Fourth Proportional to 2,164.91, 2,986.52 and 1,280.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.91 : 2,986.52 = 1,280.30 : x
2. Step 2: Convert to fraction form
   2,164.91/2,986.52 = 1,280.30/x
3. Step 3: Cross multiply
   2,164.91x = 2,986.52 × 1,280.30
4. Step 4: Simplify right side
   2,164.91x = 3,823,620.22
5. Step 5: Solve for x
   x = 3,823,620.22/2,164.91
6. Step 6: Final answer
   x = 1,766.18