Finding the Fourth Proportional to 2,619.90, 3,615.50 and 1,440.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.90 : 3,615.50 = 1,440.96 : x
2. Step 2: Convert to fraction form
   2,619.90/3,615.50 = 1,440.96/x
3. Step 3: Cross multiply
   2,619.90x = 3,615.50 × 1,440.96
4. Step 4: Simplify right side
   2,619.90x = 5,209,790.88
5. Step 5: Solve for x
   x = 5,209,790.88/2,619.90
6. Step 6: Final answer
   x = 1,988.55