Finding the Third Proportional to 287,719 and 632,540

Step by Step Solution

1. Step 1: Write the proportion equation
   287,719 : 632,540 = 632,540 : x
2. Step 2: Convert to fraction form
   287,719/632,540 = 632,540/x
3. Step 3: Cross multiply
   287,719x = 632,540 × 632,540
4. Step 4: Simplify right side
   287,719x = 400,106,851,600
5. Step 5: Solve for x
   x = 400,106,851,600/287,719
6. Step 6: Final answer
   x = 1,390,616.72