Finding the Fourth Proportional to 11,906.03, 16,426.99 and 9,380.30

Step by Step Solution

1. Step 1: Write the proportion equation
   11,906.03 : 16,426.99 = 9,380.30 : x
2. Step 2: Convert to fraction form
   11,906.03/16,426.99 = 9,380.30/x
3. Step 3: Cross multiply
   11,906.03x = 16,426.99 × 9,380.30
4. Step 4: Simplify right side
   11,906.03x = 154,090,012.16
5. Step 5: Solve for x
   x = 154,090,012.16/11,906.03
6. Step 6: Final answer
   x = 12,942.19