Finding the Third Proportional to 89,980 and 139,686

Step by Step Solution

1. Step 1: Write the proportion equation
   89,980 : 139,686 = 139,686 : x
2. Step 2: Convert to fraction form
   89,980/139,686 = 139,686/x
3. Step 3: Cross multiply
   89,980x = 139,686 × 139,686
4. Step 4: Simplify right side
   89,980x = 19,512,178,596
5. Step 5: Solve for x
   x = 19,512,178,596/89,980
6. Step 6: Final answer
   x = 216,850.17