Finding the Fourth Proportional to 3,958.05, 5,462.20 and 2,189.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,958.05 : 5,462.20 = 2,189.78 : x
2. Step 2: Convert to fraction form
   3,958.05/5,462.20 = 2,189.78/x
3. Step 3: Cross multiply
   3,958.05x = 5,462.20 × 2,189.78
4. Step 4: Simplify right side
   3,958.05x = 11,961,016.32
5. Step 5: Solve for x
   x = 11,961,016.32/3,958.05
6. Step 6: Final answer
   x = 3,021.95