Finding the Fourth Proportional to 16,978.82, 23,430.81 and 9,425.30

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.82 : 23,430.81 = 9,425.30 : x
2. Step 2: Convert to fraction form
   16,978.82/23,430.81 = 9,425.30/x
3. Step 3: Cross multiply
   16,978.82x = 23,430.81 × 9,425.30
4. Step 4: Simplify right side
   16,978.82x = 220,842,413.49
5. Step 5: Solve for x
   x = 220,842,413.49/16,978.82
6. Step 6: Final answer
   x = 13,006.94