Finding the Third Proportional to 300,248 and 642,448

Step by Step Solution

1. Step 1: Write the proportion equation
   300,248 : 642,448 = 642,448 : x
2. Step 2: Convert to fraction form
   300,248/642,448 = 642,448/x
3. Step 3: Cross multiply
   300,248x = 642,448 × 642,448
4. Step 4: Simplify right side
   300,248x = 412,739,432,704
5. Step 5: Solve for x
   x = 412,739,432,704/300,248
6. Step 6: Final answer
   x = 1,374,661.72