Finding the Third Proportional to 2,939.63 and 3,989.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,939.63 : 3,989.25 = 3,989.25 : x
2. Step 2: Convert to fraction form
   2,939.63/3,989.25 = 3,989.25/x
3. Step 3: Cross multiply
   2,939.63x = 3,989.25 × 3,989.25
4. Step 4: Simplify right side
   2,939.63x = 15,914,115.56
5. Step 5: Solve for x
   x = 15,914,115.56/2,939.63
6. Step 6: Final answer
   x = 5,413.65