Finding the Third Proportional to 312,150 and 671,644

Step by Step Solution

1. Step 1: Write the proportion equation
   312,150 : 671,644 = 671,644 : x
2. Step 2: Convert to fraction form
   312,150/671,644 = 671,644/x
3. Step 3: Cross multiply
   312,150x = 671,644 × 671,644
4. Step 4: Simplify right side
   312,150x = 451,105,662,736
5. Step 5: Solve for x
   x = 451,105,662,736/312,150
6. Step 6: Final answer
   x = 1,445,156.70