Finding the Fourth Proportional to 2,619.78, 3,615.27 and 1,440.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.78 : 3,615.27 = 1,440.83 : x
2. Step 2: Convert to fraction form
   2,619.78/3,615.27 = 1,440.83/x
3. Step 3: Cross multiply
   2,619.78x = 3,615.27 × 1,440.83
4. Step 4: Simplify right side
   2,619.78x = 5,208,971.40
5. Step 5: Solve for x
   x = 5,208,971.40/2,619.78
6. Step 6: Final answer
   x = 1,988.32