Finding the Third Proportional to 67,087 and 139,619

Step by Step Solution

1. Step 1: Write the proportion equation
   67,087 : 139,619 = 139,619 : x
2. Step 2: Convert to fraction form
   67,087/139,619 = 139,619/x
3. Step 3: Cross multiply
   67,087x = 139,619 × 139,619
4. Step 4: Simplify right side
   67,087x = 19,493,465,161
5. Step 5: Solve for x
   x = 19,493,465,161/67,087
6. Step 6: Final answer
   x = 290,569.93