Finding the Third Proportional to 1,439.63 and 3,139.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.63 : 3,139.38 = 3,139.38 : x
2. Step 2: Convert to fraction form
   1,439.63/3,139.38 = 3,139.38/x
3. Step 3: Cross multiply
   1,439.63x = 3,139.38 × 3,139.38
4. Step 4: Simplify right side
   1,439.63x = 9,855,675.39
5. Step 5: Solve for x
   x = 9,855,675.39/1,439.63
6. Step 6: Final answer
   x = 6,846.00