Finding the Fourth Proportional to 16,978, 23,428.56 and 9,424.48

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978 : 23,428.56 = 9,424.48 : x
2. Step 2: Convert to fraction form
   16,978/23,428.56 = 9,424.48/x
3. Step 3: Cross multiply
   16,978x = 23,428.56 × 9,424.48
4. Step 4: Simplify right side
   16,978x = 220,801,995.15
5. Step 5: Solve for x
   x = 220,801,995.15/16,978
6. Step 6: Final answer
   x = 13,005.18