Finding the Fourth Proportional to 2,165.48, 3,240.09 and 1,284.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,165.48 : 3,240.09 = 1,284.76 : x
2. Step 2: Convert to fraction form
   2,165.48/3,240.09 = 1,284.76/x
3. Step 3: Cross multiply
   2,165.48x = 3,240.09 × 1,284.76
4. Step 4: Simplify right side
   2,165.48x = 4,162,721.83
5. Step 5: Solve for x
   x = 4,162,721.83/2,165.48
6. Step 6: Final answer
   x = 1,922.31