Finding the Third Proportional to 280,300 and 612,764

Step by Step Solution

1. Step 1: Write the proportion equation
   280,300 : 612,764 = 612,764 : x
2. Step 2: Convert to fraction form
   280,300/612,764 = 612,764/x
3. Step 3: Cross multiply
   280,300x = 612,764 × 612,764
4. Step 4: Simplify right side
   280,300x = 375,479,719,696
5. Step 5: Solve for x
   x = 375,479,719,696/280,300
6. Step 6: Final answer
   x = 1,339,563.75