Finding the Fourth Proportional to 23,012.55, 31,755.02 and 12,939.39

Step by Step Solution

1. Step 1: Write the proportion equation
   23,012.55 : 31,755.02 = 12,939.39 : x
2. Step 2: Convert to fraction form
   23,012.55/31,755.02 = 12,939.39/x
3. Step 3: Cross multiply
   23,012.55x = 31,755.02 × 12,939.39
4. Step 4: Simplify right side
   23,012.55x = 410,890,523.54
5. Step 5: Solve for x
   x = 410,890,523.54/23,012.55
6. Step 6: Final answer
   x = 17,855.06