Finding the Fourth Proportional to 16,770.72, 23,142.28 and 9,216.92

Step by Step Solution

1. Step 1: Write the proportion equation
   16,770.72 : 23,142.28 = 9,216.92 : x
2. Step 2: Convert to fraction form
   16,770.72/23,142.28 = 9,216.92/x
3. Step 3: Cross multiply
   16,770.72x = 23,142.28 × 9,216.92
4. Step 4: Simplify right side
   16,770.72x = 213,300,543.38
5. Step 5: Solve for x
   x = 213,300,543.38/16,770.72
6. Step 6: Final answer
   x = 12,718.63