Finding the Third Proportional to 280,960 and 621,008

Step by Step Solution

1. Step 1: Write the proportion equation
   280,960 : 621,008 = 621,008 : x
2. Step 2: Convert to fraction form
   280,960/621,008 = 621,008/x
3. Step 3: Cross multiply
   280,960x = 621,008 × 621,008
4. Step 4: Simplify right side
   280,960x = 385,650,936,064
5. Step 5: Solve for x
   x = 385,650,936,064/280,960
6. Step 6: Final answer
   x = 1,372,618.65