Finding the Third Proportional to 408,066 and 612,099

Step by Step Solution

1. Step 1: Write the proportion equation
   408,066 : 612,099 = 612,099 : x
2. Step 2: Convert to fraction form
   408,066/612,099 = 612,099/x
3. Step 3: Cross multiply
   408,066x = 612,099 × 612,099
4. Step 4: Simplify right side
   408,066x = 374,665,185,801
5. Step 5: Solve for x
   x = 374,665,185,801/408,066
6. Step 6: Final answer
   x = 918,148.50