Finding the Third Proportional to 67,066 and 139,640

Step by Step Solution

1. Step 1: Write the proportion equation
   67,066 : 139,640 = 139,640 : x
2. Step 2: Convert to fraction form
   67,066/139,640 = 139,640/x
3. Step 3: Cross multiply
   67,066x = 139,640 × 139,640
4. Step 4: Simplify right side
   67,066x = 19,499,329,600
5. Step 5: Solve for x
   x = 19,499,329,600/67,066
6. Step 6: Final answer
   x = 290,748.36