Finding the Third Proportional to 89,712 and 139,306

Step by Step Solution

1. Step 1: Write the proportion equation
   89,712 : 139,306 = 139,306 : x
2. Step 2: Convert to fraction form
   89,712/139,306 = 139,306/x
3. Step 3: Cross multiply
   89,712x = 139,306 × 139,306
4. Step 4: Simplify right side
   89,712x = 19,406,161,636
5. Step 5: Solve for x
   x = 19,406,161,636/89,712
6. Step 6: Final answer
   x = 216,316.23