Finding the Third Proportional to 1,389.75 and 3,039.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,389.75 : 3,039.38 = 3,039.38 : x
2. Step 2: Convert to fraction form
   1,389.75/3,039.38 = 3,039.38/x
3. Step 3: Cross multiply
   1,389.75x = 3,039.38 × 3,039.38
4. Step 4: Simplify right side
   1,389.75x = 9,237,800.39
5. Step 5: Solve for x
   x = 9,237,800.39/1,389.75
6. Step 6: Final answer
   x = 6,647.10