Finding the Third Proportional to 68,215.50 and 139,205.25

Step by Step Solution

1. Step 1: Write the proportion equation
   68,215.50 : 139,205.25 = 139,205.25 : x
2. Step 2: Convert to fraction form
   68,215.50/139,205.25 = 139,205.25/x
3. Step 3: Cross multiply
   68,215.50x = 139,205.25 × 139,205.25
4. Step 4: Simplify right side
   68,215.50x = 19,378,101,627.56
5. Step 5: Solve for x
   x = 19,378,101,627.56/68,215.50
6. Step 6: Final answer
   x = 284,071.83