Finding the Fourth Proportional to 16,747.92, 23,116.32 and 9,678.78

Step by Step Solution

1. Step 1: Write the proportion equation
   16,747.92 : 23,116.32 = 9,678.78 : x
2. Step 2: Convert to fraction form
   16,747.92/23,116.32 = 9,678.78/x
3. Step 3: Cross multiply
   16,747.92x = 23,116.32 × 9,678.78
4. Step 4: Simplify right side
   16,747.92x = 223,737,775.69
5. Step 5: Solve for x
   x = 223,737,775.69/16,747.92
6. Step 6: Final answer
   x = 13,359.14