Finding the Third Proportional to 291,243 and 622,978

Step by Step Solution

1. Step 1: Write the proportion equation
   291,243 : 622,978 = 622,978 : x
2. Step 2: Convert to fraction form
   291,243/622,978 = 622,978/x
3. Step 3: Cross multiply
   291,243x = 622,978 × 622,978
4. Step 4: Simplify right side
   291,243x = 388,101,588,484
5. Step 5: Solve for x
   x = 388,101,588,484/291,243
6. Step 6: Final answer
   x = 1,332,569.67