Finding the Third Proportional to 525,336 and 812,640

Step by Step Solution

1. Step 1: Write the proportion equation
   525,336 : 812,640 = 812,640 : x
2. Step 2: Convert to fraction form
   525,336/812,640 = 812,640/x
3. Step 3: Cross multiply
   525,336x = 812,640 × 812,640
4. Step 4: Simplify right side
   525,336x = 660,383,769,600
5. Step 5: Solve for x
   x = 660,383,769,600/525,336
6. Step 6: Final answer
   x = 1,257,069.32