Finding the Fourth Proportional to 2,164.66, 2,987.28 and 1,280.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.66 : 2,987.28 = 1,280.62 : x
2. Step 2: Convert to fraction form
   2,164.66/2,987.28 = 1,280.62/x
3. Step 3: Cross multiply
   2,164.66x = 2,987.28 × 1,280.62
4. Step 4: Simplify right side
   2,164.66x = 3,825,570.51
5. Step 5: Solve for x
   x = 3,825,570.51/2,164.66
6. Step 6: Final answer
   x = 1,767.28