Finding the Fourth Proportional to 2,164.32, 2,987.15 and 1,280.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.32 : 2,987.15 = 1,280.61 : x
2. Step 2: Convert to fraction form
   2,164.32/2,987.15 = 1,280.61/x
3. Step 3: Cross multiply
   2,164.32x = 2,987.15 × 1,280.61
4. Step 4: Simplify right side
   2,164.32x = 3,825,367.76
5. Step 5: Solve for x
   x = 3,825,367.76/2,164.32
6. Step 6: Final answer
   x = 1,767.47