Finding the Fourth Proportional to 16,770.72, 23,142.96 and 9,319.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,770.72 : 23,142.96 = 9,319.20 : x
2. Step 2: Convert to fraction form
   16,770.72/23,142.96 = 9,319.20/x
3. Step 3: Cross multiply
   16,770.72x = 23,142.96 × 9,319.20
4. Step 4: Simplify right side
   16,770.72x = 215,673,872.83
5. Step 5: Solve for x
   x = 215,673,872.83/16,770.72
6. Step 6: Final answer
   x = 12,860.14