Finding the Fourth Proportional to 23,013.05, 31,755.71 and 12,939.89

Step by Step Solution

1. Step 1: Write the proportion equation
   23,013.05 : 31,755.71 = 12,939.89 : x
2. Step 2: Convert to fraction form
   23,013.05/31,755.71 = 12,939.89/x
3. Step 3: Cross multiply
   23,013.05x = 31,755.71 × 12,939.89
4. Step 4: Simplify right side
   23,013.05x = 410,915,329.57
5. Step 5: Solve for x
   x = 410,915,329.57/23,013.05
6. Step 6: Final answer
   x = 17,855.75