Finding the Third Proportional to 89,039 and 138,664

Step by Step Solution

1. Step 1: Write the proportion equation
   89,039 : 138,664 = 138,664 : x
2. Step 2: Convert to fraction form
   89,039/138,664 = 138,664/x
3. Step 3: Cross multiply
   89,039x = 138,664 × 138,664
4. Step 4: Simplify right side
   89,039x = 19,227,704,896
5. Step 5: Solve for x
   x = 19,227,704,896/89,039
6. Step 6: Final answer
   x = 215,947.00