Finding the Third Proportional to 259,648.50 and 616,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   259,648.50 : 616,315.50 = 616,315.50 : x
2. Step 2: Convert to fraction form
   259,648.50/616,315.50 = 616,315.50/x
3. Step 3: Cross multiply
   259,648.50x = 616,315.50 × 616,315.50
4. Step 4: Simplify right side
   259,648.50x = 379,844,795,540.25
5. Step 5: Solve for x
   x = 379,844,795,540.25/259,648.50
6. Step 6: Final answer
   x = 1,462,919.28