Finding the Third Proportional to 300,799.50 and 642,201

Step by Step Solution

1. Step 1: Write the proportion equation
   300,799.50 : 642,201 = 642,201 : x
2. Step 2: Convert to fraction form
   300,799.50/642,201 = 642,201/x
3. Step 3: Cross multiply
   300,799.50x = 642,201 × 642,201
4. Step 4: Simplify right side
   300,799.50x = 412,422,124,401
5. Step 5: Solve for x
   x = 412,422,124,401/300,799.50
6. Step 6: Final answer
   x = 1,371,086.47