Finding the Fourth Proportional to 12,939.84, 17,838.90 and 10,942.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,939.84 : 17,838.90 = 10,942.38 : x
2. Step 2: Convert to fraction form
   12,939.84/17,838.90 = 10,942.38/x
3. Step 3: Cross multiply
   12,939.84x = 17,838.90 × 10,942.38
4. Step 4: Simplify right side
   12,939.84x = 195,200,022.58
5. Step 5: Solve for x
   x = 195,200,022.58/12,939.84
6. Step 6: Final answer
   x = 15,085.20