Finding the Third Proportional to 300,609 and 450,085.50

Step by Step Solution

1. Step 1: Write the proportion equation
   300,609 : 450,085.50 = 450,085.50 : x
2. Step 2: Convert to fraction form
   300,609/450,085.50 = 450,085.50/x
3. Step 3: Cross multiply
   300,609x = 450,085.50 × 450,085.50
4. Step 4: Simplify right side
   300,609x = 202,576,957,310.25
5. Step 5: Solve for x
   x = 202,576,957,310.25/300,609
6. Step 6: Final answer
   x = 673,888.53