Finding the Fourth Proportional to 2,165.91, 2,987.89 and 1,281.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.91 : 2,987.89 = 1,281.30 : x
2. Step 2: Convert to fraction form
   2,165.91/2,987.89 = 1,281.30/x
3. Step 3: Cross multiply
   2,165.91x = 2,987.89 × 1,281.30
4. Step 4: Simplify right side
   2,165.91x = 3,828,383.46
5. Step 5: Solve for x
   x = 3,828,383.46/2,165.91
6. Step 6: Final answer
   x = 1,767.56