Finding the Fourth Proportional to 2,165.40, 2,987.73 and 1,281.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.40 : 2,987.73 = 1,281.42 : x
2. Step 2: Convert to fraction form
   2,165.40/2,987.73 = 1,281.42/x
3. Step 3: Cross multiply
   2,165.40x = 2,987.73 × 1,281.42
4. Step 4: Simplify right side
   2,165.40x = 3,828,536.98
5. Step 5: Solve for x
   x = 3,828,536.98/2,165.40
6. Step 6: Final answer
   x = 1,768.05