Finding the Third Proportional to 400,851 and 644,719.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,851 : 644,719.50 = 644,719.50 : x
2. Step 2: Convert to fraction form
   400,851/644,719.50 = 644,719.50/x
3. Step 3: Cross multiply
   400,851x = 644,719.50 × 644,719.50
4. Step 4: Simplify right side
   400,851x = 415,663,233,680.25
5. Step 5: Solve for x
   x = 415,663,233,680.25/400,851
6. Step 6: Final answer
   x = 1,036,951.97