Finding the Third Proportional to 68,198.50 and 139,776.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,198.50 : 139,776.50 = 139,776.50 : x
2. Step 2: Convert to fraction form
   68,198.50/139,776.50 = 139,776.50/x
3. Step 3: Cross multiply
   68,198.50x = 139,776.50 × 139,776.50
4. Step 4: Simplify right side
   68,198.50x = 19,537,469,952.25
5. Step 5: Solve for x
   x = 19,537,469,952.25/68,198.50
6. Step 6: Final answer
   x = 286,479.47