Finding the Third Proportional to 89,868 and 139,180

Step by Step Solution

1. Step 1: Write the proportion equation
   89,868 : 139,180 = 139,180 : x
2. Step 2: Convert to fraction form
   89,868/139,180 = 139,180/x
3. Step 3: Cross multiply
   89,868x = 139,180 × 139,180
4. Step 4: Simplify right side
   89,868x = 19,371,072,400
5. Step 5: Solve for x
   x = 19,371,072,400/89,868
6. Step 6: Final answer
   x = 215,550.28