Finding the Third Proportional to 89,761 and 138,981

Step by Step Solution

1. Step 1: Write the proportion equation
   89,761 : 138,981 = 138,981 : x
2. Step 2: Convert to fraction form
   89,761/138,981 = 138,981/x
3. Step 3: Cross multiply
   89,761x = 138,981 × 138,981
4. Step 4: Simplify right side
   89,761x = 19,315,718,361
5. Step 5: Solve for x
   x = 19,315,718,361/89,761
6. Step 6: Final answer
   x = 215,190.54