Finding the Fourth Proportional to 20,769.81, 31,159.98 and 5,978.73

Step by Step Solution

1. Step 1: Write the proportion equation
   20,769.81 : 31,159.98 = 5,978.73 : x
2. Step 2: Convert to fraction form
   20,769.81/31,159.98 = 5,978.73/x
3. Step 3: Cross multiply
   20,769.81x = 31,159.98 × 5,978.73
4. Step 4: Simplify right side
   20,769.81x = 186,297,107.23
5. Step 5: Solve for x
   x = 186,297,107.23/20,769.81
6. Step 6: Final answer
   x = 8,969.61