Finding the Third Proportional to 90,460 and 138,039

Step by Step Solution

1. Step 1: Write the proportion equation
   90,460 : 138,039 = 138,039 : x
2. Step 2: Convert to fraction form
   90,460/138,039 = 138,039/x
3. Step 3: Cross multiply
   90,460x = 138,039 × 138,039
4. Step 4: Simplify right side
   90,460x = 19,054,765,521
5. Step 5: Solve for x
   x = 19,054,765,521/90,460
6. Step 6: Final answer
   x = 210,643.00