Finding the Third Proportional to 300,222 and 638,586

Step by Step Solution

1. Step 1: Write the proportion equation
   300,222 : 638,586 = 638,586 : x
2. Step 2: Convert to fraction form
   300,222/638,586 = 638,586/x
3. Step 3: Cross multiply
   300,222x = 638,586 × 638,586
4. Step 4: Simplify right side
   300,222x = 407,792,079,396
5. Step 5: Solve for x
   x = 407,792,079,396/300,222
6. Step 6: Final answer
   x = 1,358,301.79