Finding the Third Proportional to 305,907 and 620,356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   305,907 : 620,356.50 = 620,356.50 : x
2. Step 2: Convert to fraction form
   305,907/620,356.50 = 620,356.50/x
3. Step 3: Cross multiply
   305,907x = 620,356.50 × 620,356.50
4. Step 4: Simplify right side
   305,907x = 384,842,187,092.25
5. Step 5: Solve for x
   x = 384,842,187,092.25/305,907
6. Step 6: Final answer
   x = 1,258,036.55