Finding the Third Proportional to 312,272 and 671,906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,272 : 671,906.50 = 671,906.50 : x
2. Step 2: Convert to fraction form
   312,272/671,906.50 = 671,906.50/x
3. Step 3: Cross multiply
   312,272x = 671,906.50 × 671,906.50
4. Step 4: Simplify right side
   312,272x = 451,458,344,742.25
5. Step 5: Solve for x
   x = 451,458,344,742.25/312,272
6. Step 6: Final answer
   x = 1,445,721.50