Finding the Third Proportional to 415,216 and 620,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,216 : 620,661.50 = 620,661.50 : x
2. Step 2: Convert to fraction form
   415,216/620,661.50 = 620,661.50/x
3. Step 3: Cross multiply
   415,216x = 620,661.50 × 620,661.50
4. Step 4: Simplify right side
   415,216x = 385,220,697,582.25
5. Step 5: Solve for x
   x = 385,220,697,582.25/415,216
6. Step 6: Final answer
   x = 927,759.76