Finding the Third Proportional to 300,865.50 and 620,796

Step by Step Solution

1. Step 1: Write the proportion equation
   300,865.50 : 620,796 = 620,796 : x
2. Step 2: Convert to fraction form
   300,865.50/620,796 = 620,796/x
3. Step 3: Cross multiply
   300,865.50x = 620,796 × 620,796
4. Step 4: Simplify right side
   300,865.50x = 385,387,673,616
5. Step 5: Solve for x
   x = 385,387,673,616/300,865.50
6. Step 6: Final answer
   x = 1,280,930.10