Finding the Third Proportional to 150,481 and 320,978

Step by Step Solution

1. Step 1: Write the proportion equation
   150,481 : 320,978 = 320,978 : x
2. Step 2: Convert to fraction form
   150,481/320,978 = 320,978/x
3. Step 3: Cross multiply
   150,481x = 320,978 × 320,978
4. Step 4: Simplify right side
   150,481x = 103,026,876,484
5. Step 5: Solve for x
   x = 103,026,876,484/150,481
6. Step 6: Final answer
   x = 684,650.40