Finding the Third Proportional to 643,212 and 945,546

Step by Step Solution

1. Step 1: Write the proportion equation
   643,212 : 945,546 = 945,546 : x
2. Step 2: Convert to fraction form
   643,212/945,546 = 945,546/x
3. Step 3: Cross multiply
   643,212x = 945,546 × 945,546
4. Step 4: Simplify right side
   643,212x = 894,057,238,116
5. Step 5: Solve for x
   x = 894,057,238,116/643,212
6. Step 6: Final answer
   x = 1,389,988.43