Finding the Third Proportional to 89,720 and 139,314

Step by Step Solution

1. Step 1: Write the proportion equation
   89,720 : 139,314 = 139,314 : x
2. Step 2: Convert to fraction form
   89,720/139,314 = 139,314/x
3. Step 3: Cross multiply
   89,720x = 139,314 × 139,314
4. Step 4: Simplify right side
   89,720x = 19,408,390,596
5. Step 5: Solve for x
   x = 19,408,390,596/89,720
6. Step 6: Final answer
   x = 216,321.79