Finding the Third Proportional to 287,456 and 622,912

Step by Step Solution

1. Step 1: Write the proportion equation
   287,456 : 622,912 = 622,912 : x
2. Step 2: Convert to fraction form
   287,456/622,912 = 622,912/x
3. Step 3: Cross multiply
   287,456x = 622,912 × 622,912
4. Step 4: Simplify right side
   287,456x = 388,019,359,744
5. Step 5: Solve for x
   x = 388,019,359,744/287,456
6. Step 6: Final answer
   x = 1,349,839.14