Finding the Fourth Proportional to 2,619.80, 3,615.38 and 1,440.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.80 : 3,615.38 = 1,440.98 : x
2. Step 2: Convert to fraction form
   2,619.80/3,615.38 = 1,440.98/x
3. Step 3: Cross multiply
   2,619.80x = 3,615.38 × 1,440.98
4. Step 4: Simplify right side
   2,619.80x = 5,209,690.27
5. Step 5: Solve for x
   x = 5,209,690.27/2,619.80
6. Step 6: Final answer
   x = 1,988.58