Finding the Fourth Proportional to 2,619.62, 3,615.15 and 1,440.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.62 : 3,615.15 = 1,440.77 : x
2. Step 2: Convert to fraction form
   2,619.62/3,615.15 = 1,440.77/x
3. Step 3: Cross multiply
   2,619.62x = 3,615.15 × 1,440.77
4. Step 4: Simplify right side
   2,619.62x = 5,208,581.59
5. Step 5: Solve for x
   x = 5,208,581.59/2,619.62
6. Step 6: Final answer
   x = 1,988.30