Finding the Third Proportional to 67,065 and 139,639.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,065 : 139,639.50 = 139,639.50 : x
2. Step 2: Convert to fraction form
   67,065/139,639.50 = 139,639.50/x
3. Step 3: Cross multiply
   67,065x = 139,639.50 × 139,639.50
4. Step 4: Simplify right side
   67,065x = 19,499,189,960.25
5. Step 5: Solve for x
   x = 19,499,189,960.25/67,065
6. Step 6: Final answer
   x = 290,750.61