Finding the Fourth Proportional to 20,449.29, 30,659.57 and 7,958.78

Step by Step Solution

1. Step 1: Write the proportion equation
   20,449.29 : 30,659.57 = 7,958.78 : x
2. Step 2: Convert to fraction form
   20,449.29/30,659.57 = 7,958.78/x
3. Step 3: Cross multiply
   20,449.29x = 30,659.57 × 7,958.78
4. Step 4: Simplify right side
   20,449.29x = 244,012,772.52
5. Step 5: Solve for x
   x = 244,012,772.52/20,449.29
6. Step 6: Final answer
   x = 11,932.58