Finding the Fourth Proportional to 16,817.89, 25,229.60 and 5,128.38

Step by Step Solution

1. Step 1: Write the proportion equation
   16,817.89 : 25,229.60 = 5,128.38 : x
2. Step 2: Convert to fraction form
   16,817.89/25,229.60 = 5,128.38/x
3. Step 3: Cross multiply
   16,817.89x = 25,229.60 × 5,128.38
4. Step 4: Simplify right side
   16,817.89x = 129,386,976.05
5. Step 5: Solve for x
   x = 129,386,976.05/16,817.89
6. Step 6: Final answer
   x = 7,693.41