Finding the Fourth Proportional to 16,890.98, 23,308.54 and 9,336.86

Step by Step Solution

1. Step 1: Write the proportion equation
   16,890.98 : 23,308.54 = 9,336.86 : x
2. Step 2: Convert to fraction form
   16,890.98/23,308.54 = 9,336.86/x
3. Step 3: Cross multiply
   16,890.98x = 23,308.54 × 9,336.86
4. Step 4: Simplify right side
   16,890.98x = 217,628,574.78
5. Step 5: Solve for x
   x = 217,628,574.78/16,890.98
6. Step 6: Final answer
   x = 12,884.31