Finding the Third Proportional to 90,878 and 139,494

Step by Step Solution

1. Step 1: Write the proportion equation
   90,878 : 139,494 = 139,494 : x
2. Step 2: Convert to fraction form
   90,878/139,494 = 139,494/x
3. Step 3: Cross multiply
   90,878x = 139,494 × 139,494
4. Step 4: Simplify right side
   90,878x = 19,458,576,036
5. Step 5: Solve for x
   x = 19,458,576,036/90,878
6. Step 6: Final answer
   x = 214,117.56