Finding the Fourth Proportional to 16,980.72, 23,436.20 and 9,429.48

Step by Step Solution

1. Step 1: Write the proportion equation
   16,980.72 : 23,436.20 = 9,429.48 : x
2. Step 2: Convert to fraction form
   16,980.72/23,436.20 = 9,429.48/x
3. Step 3: Cross multiply
   16,980.72x = 23,436.20 × 9,429.48
4. Step 4: Simplify right side
   16,980.72x = 220,991,179.18
5. Step 5: Solve for x
   x = 220,991,179.18/16,980.72
6. Step 6: Final answer
   x = 13,014.24