Finding the Fourth Proportional to 16,983.12, 23,436.78 and 9,429.60

Step by Step Solution

1. Step 1: Write the proportion equation
   16,983.12 : 23,436.78 = 9,429.60 : x
2. Step 2: Convert to fraction form
   16,983.12/23,436.78 = 9,429.60/x
3. Step 3: Cross multiply
   16,983.12x = 23,436.78 × 9,429.60
4. Step 4: Simplify right side
   16,983.12x = 220,999,460.69
5. Step 5: Solve for x
   x = 220,999,460.69/16,983.12
6. Step 6: Final answer
   x = 13,012.89