Finding the Fourth Proportional to 2,185.50, 3,015.23 and 1,440.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.50 : 3,015.23 = 1,440.21 : x
2. Step 2: Convert to fraction form
   2,185.50/3,015.23 = 1,440.21/x
3. Step 3: Cross multiply
   2,185.50x = 3,015.23 × 1,440.21
4. Step 4: Simplify right side
   2,185.50x = 4,342,568.50
5. Step 5: Solve for x
   x = 4,342,568.50/2,185.50
6. Step 6: Final answer
   x = 1,986.99