Finding the Fourth Proportional to 16,958.81, 23,403.16 and 9,406.30

Step by Step Solution

1. Step 1: Write the proportion equation
   16,958.81 : 23,403.16 = 9,406.30 : x
2. Step 2: Convert to fraction form
   16,958.81/23,403.16 = 9,406.30/x
3. Step 3: Cross multiply
   16,958.81x = 23,403.16 × 9,406.30
4. Step 4: Simplify right side
   16,958.81x = 220,136,979.86
5. Step 5: Solve for x
   x = 220,136,979.86/16,958.81
6. Step 6: Final answer
   x = 12,980.69