Finding the Fourth Proportional to 2,105.76, 3,161.38 and 1,619.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.76 : 3,161.38 = 1,619.15 : x
2. Step 2: Convert to fraction form
   2,105.76/3,161.38 = 1,619.15/x
3. Step 3: Cross multiply
   2,105.76x = 3,161.38 × 1,619.15
4. Step 4: Simplify right side
   2,105.76x = 5,118,752.28
5. Step 5: Solve for x
   x = 5,118,752.28/2,105.76
6. Step 6: Final answer
   x = 2,430.83