Finding the Third Proportional to 300,720 and 447,840

Step by Step Solution

1. Step 1: Write the proportion equation
   300,720 : 447,840 = 447,840 : x
2. Step 2: Convert to fraction form
   300,720/447,840 = 447,840/x
3. Step 3: Cross multiply
   300,720x = 447,840 × 447,840
4. Step 4: Simplify right side
   300,720x = 200,560,665,600
5. Step 5: Solve for x
   x = 200,560,665,600/300,720
6. Step 6: Final answer
   x = 666,934.91