Finding the Third Proportional to 312,054 and 638,896.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,054 : 638,896.50 = 638,896.50 : x
2. Step 2: Convert to fraction form
   312,054/638,896.50 = 638,896.50/x
3. Step 3: Cross multiply
   312,054x = 638,896.50 × 638,896.50
4. Step 4: Simplify right side
   312,054x = 408,188,737,712.25
5. Step 5: Solve for x
   x = 408,188,737,712.25/312,054
6. Step 6: Final answer
   x = 1,308,070.84