Finding the Third Proportional to 415,218 and 620,664.75

Step by Step Solution

1. Step 1: Write the proportion equation
   415,218 : 620,664.75 = 620,664.75 : x
2. Step 2: Convert to fraction form
   415,218/620,664.75 = 620,664.75/x
3. Step 3: Cross multiply
   415,218x = 620,664.75 × 620,664.75
4. Step 4: Simplify right side
   415,218x = 385,224,731,892.56
5. Step 5: Solve for x
   x = 385,224,731,892.56/415,218
6. Step 6: Final answer
   x = 927,765.01