Finding the Third Proportional to 443,446.50 and 685,117.50

Step by Step Solution

1. Step 1: Write the proportion equation
   443,446.50 : 685,117.50 = 685,117.50 : x
2. Step 2: Convert to fraction form
   443,446.50/685,117.50 = 685,117.50/x
3. Step 3: Cross multiply
   443,446.50x = 685,117.50 × 685,117.50
4. Step 4: Simplify right side
   443,446.50x = 469,385,988,806.25
5. Step 5: Solve for x
   x = 469,385,988,806.25/443,446.50
6. Step 6: Final answer
   x = 1,058,495.19