Finding the Third Proportional to 90,272 and 139,706

Step by Step Solution

1. Step 1: Write the proportion equation
   90,272 : 139,706 = 139,706 : x
2. Step 2: Convert to fraction form
   90,272/139,706 = 139,706/x
3. Step 3: Cross multiply
   90,272x = 139,706 × 139,706
4. Step 4: Simplify right side
   90,272x = 19,517,766,436
5. Step 5: Solve for x
   x = 19,517,766,436/90,272
6. Step 6: Final answer
   x = 216,210.63