Finding the Third Proportional to 407,811 and 620,356.50

Step by Step Solution

1. Step 1: Write the proportion equation
   407,811 : 620,356.50 = 620,356.50 : x
2. Step 2: Convert to fraction form
   407,811/620,356.50 = 620,356.50/x
3. Step 3: Cross multiply
   407,811x = 620,356.50 × 620,356.50
4. Step 4: Simplify right side
   407,811x = 384,842,187,092.25
5. Step 5: Solve for x
   x = 384,842,187,092.25/407,811
6. Step 6: Final answer
   x = 943,677.80