Finding the Fourth Proportional to 16,982, 23,436.56 and 9,428.80

Step by Step Solution

1. Step 1: Write the proportion equation
   16,982 : 23,436.56 = 9,428.80 : x
2. Step 2: Convert to fraction form
   16,982/23,436.56 = 9,428.80/x
3. Step 3: Cross multiply
   16,982x = 23,436.56 × 9,428.80
4. Step 4: Simplify right side
   16,982x = 220,978,636.93
5. Step 5: Solve for x
   x = 220,978,636.93/16,982
6. Step 6: Final answer
   x = 13,012.52