Finding the Third Proportional to 280,436.50 and 612,266.50

Step by Step Solution

1. Step 1: Write the proportion equation
   280,436.50 : 612,266.50 = 612,266.50 : x
2. Step 2: Convert to fraction form
   280,436.50/612,266.50 = 612,266.50/x
3. Step 3: Cross multiply
   280,436.50x = 612,266.50 × 612,266.50
4. Step 4: Simplify right side
   280,436.50x = 374,870,267,022.25
5. Step 5: Solve for x
   x = 374,870,267,022.25/280,436.50
6. Step 6: Final answer
   x = 1,336,738.50