Finding the Fourth Proportional to 2,619.62, 3,615.16 and 1,440.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.62 : 3,615.16 = 1,440.76 : x
2. Step 2: Convert to fraction form
   2,619.62/3,615.16 = 1,440.76/x
3. Step 3: Cross multiply
   2,619.62x = 3,615.16 × 1,440.76
4. Step 4: Simplify right side
   2,619.62x = 5,208,577.92
5. Step 5: Solve for x
   x = 5,208,577.92/2,619.62
6. Step 6: Final answer
   x = 1,988.30