Finding the Third Proportional to 280,680 and 620,436

Step by Step Solution

1. Step 1: Write the proportion equation
   280,680 : 620,436 = 620,436 : x
2. Step 2: Convert to fraction form
   280,680/620,436 = 620,436/x
3. Step 3: Cross multiply
   280,680x = 620,436 × 620,436
4. Step 4: Simplify right side
   280,680x = 384,940,830,096
5. Step 5: Solve for x
   x = 384,940,830,096/280,680
6. Step 6: Final answer
   x = 1,371,458.00