Finding the Third Proportional to 90,980 and 139,352

Step by Step Solution

1. Step 1: Write the proportion equation
   90,980 : 139,352 = 139,352 : x
2. Step 2: Convert to fraction form
   90,980/139,352 = 139,352/x
3. Step 3: Cross multiply
   90,980x = 139,352 × 139,352
4. Step 4: Simplify right side
   90,980x = 19,418,979,904
5. Step 5: Solve for x
   x = 19,418,979,904/90,980
6. Step 6: Final answer
   x = 213,442.29