Finding the Third Proportional to 89,715 and 139,308

Step by Step Solution

1. Step 1: Write the proportion equation
   89,715 : 139,308 = 139,308 : x
2. Step 2: Convert to fraction form
   89,715/139,308 = 139,308/x
3. Step 3: Cross multiply
   89,715x = 139,308 × 139,308
4. Step 4: Simplify right side
   89,715x = 19,406,718,864
5. Step 5: Solve for x
   x = 19,406,718,864/89,715
6. Step 6: Final answer
   x = 216,315.21