Finding the Fourth Proportional to 16,920.78, 25,383.60 and 5,231.27

Step by Step Solution

1. Step 1: Write the proportion equation
   16,920.78 : 25,383.60 = 5,231.27 : x
2. Step 2: Convert to fraction form
   16,920.78/25,383.60 = 5,231.27/x
3. Step 3: Cross multiply
   16,920.78x = 25,383.60 × 5,231.27
4. Step 4: Simplify right side
   16,920.78x = 132,788,338.25
5. Step 5: Solve for x
   x = 132,788,338.25/16,920.78
6. Step 6: Final answer
   x = 7,847.65