Finding the Fourth Proportional to 3,958.22, 5,462.34 and 2,189.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,958.22 : 5,462.34 = 2,189.78 : x
2. Step 2: Convert to fraction form
   3,958.22/5,462.34 = 2,189.78/x
3. Step 3: Cross multiply
   3,958.22x = 5,462.34 × 2,189.78
4. Step 4: Simplify right side
   3,958.22x = 11,961,322.89
5. Step 5: Solve for x
   x = 11,961,322.89/3,958.22
6. Step 6: Final answer
   x = 3,021.89