Finding the Third Proportional to 280,408 and 611,570

Step by Step Solution

1. Step 1: Write the proportion equation
   280,408 : 611,570 = 611,570 : x
2. Step 2: Convert to fraction form
   280,408/611,570 = 611,570/x
3. Step 3: Cross multiply
   280,408x = 611,570 × 611,570
4. Step 4: Simplify right side
   280,408x = 374,017,864,900
5. Step 5: Solve for x
   x = 374,017,864,900/280,408
6. Step 6: Final answer
   x = 1,333,834.50