Finding the Third Proportional to 90,311 and 140,636

Step by Step Solution

1. Step 1: Write the proportion equation
   90,311 : 140,636 = 140,636 : x
2. Step 2: Convert to fraction form
   90,311/140,636 = 140,636/x
3. Step 3: Cross multiply
   90,311x = 140,636 × 140,636
4. Step 4: Simplify right side
   90,311x = 19,778,484,496
5. Step 5: Solve for x
   x = 19,778,484,496/90,311
6. Step 6: Final answer
   x = 219,004.16