Finding the Third Proportional to 89,718 and 139,315

Step by Step Solution

1. Step 1: Write the proportion equation
   89,718 : 139,315 = 139,315 : x
2. Step 2: Convert to fraction form
   89,718/139,315 = 139,315/x
3. Step 3: Cross multiply
   89,718x = 139,315 × 139,315
4. Step 4: Simplify right side
   89,718x = 19,408,669,225
5. Step 5: Solve for x
   x = 19,408,669,225/89,718
6. Step 6: Final answer
   x = 216,329.71