Finding the Third Proportional to 312,152 and 671,648

Step by Step Solution

1. Step 1: Write the proportion equation
   312,152 : 671,648 = 671,648 : x
2. Step 2: Convert to fraction form
   312,152/671,648 = 671,648/x
3. Step 3: Cross multiply
   312,152x = 671,648 × 671,648
4. Step 4: Simplify right side
   312,152x = 451,111,035,904
5. Step 5: Solve for x
   x = 451,111,035,904/312,152
6. Step 6: Final answer
   x = 1,445,164.65