Finding the Third Proportional to 90,356 and 139,630

Step by Step Solution

1. Step 1: Write the proportion equation
   90,356 : 139,630 = 139,630 : x
2. Step 2: Convert to fraction form
   90,356/139,630 = 139,630/x
3. Step 3: Cross multiply
   90,356x = 139,630 × 139,630
4. Step 4: Simplify right side
   90,356x = 19,496,536,900
5. Step 5: Solve for x
   x = 19,496,536,900/90,356
6. Step 6: Final answer
   x = 215,774.68