Finding the Third Proportional to 312,048 and 638,884.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,048 : 638,884.50 = 638,884.50 : x
2. Step 2: Convert to fraction form
   312,048/638,884.50 = 638,884.50/x
3. Step 3: Cross multiply
   312,048x = 638,884.50 × 638,884.50
4. Step 4: Simplify right side
   312,048x = 408,173,404,340.25
5. Step 5: Solve for x
   x = 408,173,404,340.25/312,048
6. Step 6: Final answer
   x = 1,308,046.85