Finding the Fourth Proportional to 16,678.38, 23,016.17 and 10,390.75

Step by Step Solution

1. Step 1: Write the proportion equation
   16,678.38 : 23,016.17 = 10,390.75 : x
2. Step 2: Convert to fraction form
   16,678.38/23,016.17 = 10,390.75/x
3. Step 3: Cross multiply
   16,678.38x = 23,016.17 × 10,390.75
4. Step 4: Simplify right side
   16,678.38x = 239,155,268.43
5. Step 5: Solve for x
   x = 239,155,268.43/16,678.38
6. Step 6: Final answer
   x = 14,339.24