Finding the Fourth Proportional to 2,619.72, 3,615.14 and 1,440.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.72 : 3,615.14 = 1,440.79 : x
2. Step 2: Convert to fraction form
   2,619.72/3,615.14 = 1,440.79/x
3. Step 3: Cross multiply
   2,619.72x = 3,615.14 × 1,440.79
4. Step 4: Simplify right side
   2,619.72x = 5,208,653.50
5. Step 5: Solve for x
   x = 5,208,653.50/2,619.72
6. Step 6: Final answer
   x = 1,988.25