Finding the Fourth Proportional to 2,619.76, 3,615.34 and 1,440.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,619.76 : 3,615.34 = 1,440.86 : x
2. Step 2: Convert to fraction form
   2,619.76/3,615.34 = 1,440.86/x
3. Step 3: Cross multiply
   2,619.76x = 3,615.34 × 1,440.86
4. Step 4: Simplify right side
   2,619.76x = 5,209,198.79
5. Step 5: Solve for x
   x = 5,209,198.79/2,619.76
6. Step 6: Final answer
   x = 1,988.43