Finding the Fourth Proportional to 16,815.18, 25,222.69 and 5,128.36

Step by Step Solution

1. Step 1: Write the proportion equation
   16,815.18 : 25,222.69 = 5,128.36 : x
2. Step 2: Convert to fraction form
   16,815.18/25,222.69 = 5,128.36/x
3. Step 3: Cross multiply
   16,815.18x = 25,222.69 × 5,128.36
4. Step 4: Simplify right side
   16,815.18x = 129,351,034.49
5. Step 5: Solve for x
   x = 129,351,034.49/16,815.18
6. Step 6: Final answer
   x = 7,692.52