Finding the Fourth Proportional to 2,105.10, 3,158.33 and 719.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.10 : 3,158.33 = 719.31 : x
2. Step 2: Convert to fraction form
   2,105.10/3,158.33 = 719.31/x
3. Step 3: Cross multiply
   2,105.10x = 3,158.33 × 719.31
4. Step 4: Simplify right side
   2,105.10x = 2,271,814.76
5. Step 5: Solve for x
   x = 2,271,814.76/2,105.10
6. Step 6: Final answer
   x = 1,079.20