Finding the Fourth Proportional to 2,164.42, 2,987.23 and 1,280.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,164.42 : 2,987.23 = 1,280.51 : x
2. Step 2: Convert to fraction form
   2,164.42/2,987.23 = 1,280.51/x
3. Step 3: Cross multiply
   2,164.42x = 2,987.23 × 1,280.51
4. Step 4: Simplify right side
   2,164.42x = 3,825,173.35
5. Step 5: Solve for x
   x = 3,825,173.35/2,164.42
6. Step 6: Final answer
   x = 1,767.30