Finding the Fourth Proportional to 16,910.78, 23,336.69 and 9,357.05

Step by Step Solution

1. Step 1: Write the proportion equation
   16,910.78 : 23,336.69 = 9,357.05 : x
2. Step 2: Convert to fraction form
   16,910.78/23,336.69 = 9,357.05/x
3. Step 3: Cross multiply
   16,910.78x = 23,336.69 × 9,357.05
4. Step 4: Simplify right side
   16,910.78x = 218,362,586.72
5. Step 5: Solve for x
   x = 218,362,586.72/16,910.78
6. Step 6: Final answer
   x = 12,912.62