Finding the Third Proportional to 311,790 and 673,404

Step by Step Solution

1. Step 1: Write the proportion equation
   311,790 : 673,404 = 673,404 : x
2. Step 2: Convert to fraction form
   311,790/673,404 = 673,404/x
3. Step 3: Cross multiply
   311,790x = 673,404 × 673,404
4. Step 4: Simplify right side
   311,790x = 453,472,947,216
5. Step 5: Solve for x
   x = 453,472,947,216/311,790
6. Step 6: Final answer
   x = 1,454,417.87