Finding the Fourth Proportional to 2,619.78, 3,615.49 and 1,440.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.78 : 3,615.49 = 1,440.88 : x
2. Step 2: Convert to fraction form
   2,619.78/3,615.49 = 1,440.88/x
3. Step 3: Cross multiply
   2,619.78x = 3,615.49 × 1,440.88
4. Step 4: Simplify right side
   2,619.78x = 5,209,487.23
5. Step 5: Solve for x
   x = 5,209,487.23/2,619.78
6. Step 6: Final answer
   x = 1,988.52