Finding the Third Proportional to 287,772 and 632,648

Step by Step Solution

1. Step 1: Write the proportion equation
   287,772 : 632,648 = 632,648 : x
2. Step 2: Convert to fraction form
   287,772/632,648 = 632,648/x
3. Step 3: Cross multiply
   287,772x = 632,648 × 632,648
4. Step 4: Simplify right side
   287,772x = 400,243,491,904
5. Step 5: Solve for x
   x = 400,243,491,904/287,772
6. Step 6: Final answer
   x = 1,390,835.42