Finding the Fourth Proportional to 20,454.89, 30,678.89 and 5,665.30

Step by Step Solution

1. Step 1: Write the proportion equation
   20,454.89 : 30,678.89 = 5,665.30 : x
2. Step 2: Convert to fraction form
   20,454.89/30,678.89 = 5,665.30/x
3. Step 3: Cross multiply
   20,454.89x = 30,678.89 × 5,665.30
4. Step 4: Simplify right side
   20,454.89x = 173,805,010.49
5. Step 5: Solve for x
   x = 173,805,010.49/20,454.89
6. Step 6: Final answer
   x = 8,496.99