Finding the Third Proportional to 311,821.50 and 673,539

Step by Step Solution

1. Step 1: Write the proportion equation
   311,821.50 : 673,539 = 673,539 : x
2. Step 2: Convert to fraction form
   311,821.50/673,539 = 673,539/x
3. Step 3: Cross multiply
   311,821.50x = 673,539 × 673,539
4. Step 4: Simplify right side
   311,821.50x = 453,654,784,521
5. Step 5: Solve for x
   x = 453,654,784,521/311,821.50
6. Step 6: Final answer
   x = 1,454,854.09