Finding the Fourth Proportional to 11,905.91, 16,426.83 and 9,380.19

Step by Step Solution

1. Step 1: Write the proportion equation
   11,905.91 : 16,426.83 = 9,380.19 : x
2. Step 2: Convert to fraction form
   11,905.91/16,426.83 = 9,380.19/x
3. Step 3: Cross multiply
   11,905.91x = 16,426.83 × 9,380.19
4. Step 4: Simplify right side
   11,905.91x = 154,086,760.07
5. Step 5: Solve for x
   x = 154,086,760.07/11,905.91
6. Step 6: Final answer
   x = 12,942.04