Finding the Third Proportional to 138,558 and 298,308

Step by Step Solution

1. Step 1: Write the proportion equation
   138,558 : 298,308 = 298,308 : x
2. Step 2: Convert to fraction form
   138,558/298,308 = 298,308/x
3. Step 3: Cross multiply
   138,558x = 298,308 × 298,308
4. Step 4: Simplify right side
   138,558x = 88,987,662,864
5. Step 5: Solve for x
   x = 88,987,662,864/138,558
6. Step 6: Final answer
   x = 642,241.25