Finding the Third Proportional to 311,908.50 and 673,617

Step by Step Solution

1. Step 1: Write the proportion equation
   311,908.50 : 673,617 = 673,617 : x
2. Step 2: Convert to fraction form
   311,908.50/673,617 = 673,617/x
3. Step 3: Cross multiply
   311,908.50x = 673,617 × 673,617
4. Step 4: Simplify right side
   311,908.50x = 453,759,862,689
5. Step 5: Solve for x
   x = 453,759,862,689/311,908.50
6. Step 6: Final answer
   x = 1,454,785.18