Finding the Third Proportional to 312,012 and 638,809.03

Step by Step Solution

1. Step 1: Write the proportion equation
   312,012 : 638,809.03 = 638,809.03 : x
2. Step 2: Convert to fraction form
   312,012/638,809.03 = 638,809.03/x
3. Step 3: Cross multiply
   312,012x = 638,809.03 × 638,809.03
4. Step 4: Simplify right side
   312,012x = 408,076,978,406.56
5. Step 5: Solve for x
   x = 408,076,978,406.56/312,012
6. Step 6: Final answer
   x = 1,307,888.73