Finding the Third Proportional to 287,546 and 620,020

Step by Step Solution

1. Step 1: Write the proportion equation
   287,546 : 620,020 = 620,020 : x
2. Step 2: Convert to fraction form
   287,546/620,020 = 620,020/x
3. Step 3: Cross multiply
   287,546x = 620,020 × 620,020
4. Step 4: Simplify right side
   287,546x = 384,424,800,400
5. Step 5: Solve for x
   x = 384,424,800,400/287,546
6. Step 6: Final answer
   x = 1,336,915.83