Finding the Fourth Proportional to 20,796.89, 31,182.50 and 8,958.20

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.89 : 31,182.50 = 8,958.20 : x
2. Step 2: Convert to fraction form
   20,796.89/31,182.50 = 8,958.20/x
3. Step 3: Cross multiply
   20,796.89x = 31,182.50 × 8,958.20
4. Step 4: Simplify right side
   20,796.89x = 279,338,937.98
5. Step 5: Solve for x
   x = 279,338,937.98/20,796.89
6. Step 6: Final answer
   x = 13,431.77