Finding the Fourth Proportional to 2,399.20, 3,312.42 and 1,958.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,399.20 : 3,312.42 = 1,958.15 : x
2. Step 2: Convert to fraction form
   2,399.20/3,312.42 = 1,958.15/x
3. Step 3: Cross multiply
   2,399.20x = 3,312.42 × 1,958.15
4. Step 4: Simplify right side
   2,399.20x = 6,486,215.22
5. Step 5: Solve for x
   x = 6,486,215.22/2,399.20
6. Step 6: Final answer
   x = 2,703.50