Finding the Third Proportional to 68,155.50 and 139,710.75

Step by Step Solution

1. Step 1: Write the proportion equation
   68,155.50 : 139,710.75 = 139,710.75 : x
2. Step 2: Convert to fraction form
   68,155.50/139,710.75 = 139,710.75/x
3. Step 3: Cross multiply
   68,155.50x = 139,710.75 × 139,710.75
4. Step 4: Simplify right side
   68,155.50x = 19,519,093,665.56
5. Step 5: Solve for x
   x = 19,519,093,665.56/68,155.50
6. Step 6: Final answer
   x = 286,390.59