Finding the Third Proportional to 307,162.50 and 638,847

Step by Step Solution

1. Step 1: Write the proportion equation
   307,162.50 : 638,847 = 638,847 : x
2. Step 2: Convert to fraction form
   307,162.50/638,847 = 638,847/x
3. Step 3: Cross multiply
   307,162.50x = 638,847 × 638,847
4. Step 4: Simplify right side
   307,162.50x = 408,125,489,409
5. Step 5: Solve for x
   x = 408,125,489,409/307,162.50
6. Step 6: Final answer
   x = 1,328,695.69