Finding the Third Proportional to 90,779 and 139,997

Step by Step Solution

1. Step 1: Write the proportion equation
   90,779 : 139,997 = 139,997 : x
2. Step 2: Convert to fraction form
   90,779/139,997 = 139,997/x
3. Step 3: Cross multiply
   90,779x = 139,997 × 139,997
4. Step 4: Simplify right side
   90,779x = 19,599,160,009
5. Step 5: Solve for x
   x = 19,599,160,009/90,779
6. Step 6: Final answer
   x = 215,899.71