Finding the Fourth Proportional to 2,164.32, 2,986.83 and 1,280.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.32 : 2,986.83 = 1,280.70 : x
2. Step 2: Convert to fraction form
   2,164.32/2,986.83 = 1,280.70/x
3. Step 3: Cross multiply
   2,164.32x = 2,986.83 × 1,280.70
4. Step 4: Simplify right side
   2,164.32x = 3,825,233.18
5. Step 5: Solve for x
   x = 3,825,233.18/2,164.32
6. Step 6: Final answer
   x = 1,767.41