Finding the Third Proportional to 323,153 and 661,978

Step by Step Solution

1. Step 1: Write the proportion equation
   323,153 : 661,978 = 661,978 : x
2. Step 2: Convert to fraction form
   323,153/661,978 = 661,978/x
3. Step 3: Cross multiply
   323,153x = 661,978 × 661,978
4. Step 4: Simplify right side
   323,153x = 438,214,872,484
5. Step 5: Solve for x
   x = 438,214,872,484/323,153
6. Step 6: Final answer
   x = 1,356,060.05