Finding the Fourth Proportional to 16,978.09, 23,428.68 and 9,424.43

Step by Step Solution

1. Step 1: Write the proportion equation
   16,978.09 : 23,428.68 = 9,424.43 : x
2. Step 2: Convert to fraction form
   16,978.09/23,428.68 = 9,424.43/x
3. Step 3: Cross multiply
   16,978.09x = 23,428.68 × 9,424.43
4. Step 4: Simplify right side
   16,978.09x = 220,801,954.65
5. Step 5: Solve for x
   x = 220,801,954.65/16,978.09
6. Step 6: Final answer
   x = 13,005.11