Finding the Third Proportional to 81,990 and 123,738

Step by Step Solution

1. Step 1: Write the proportion equation
   81,990 : 123,738 = 123,738 : x
2. Step 2: Convert to fraction form
   81,990/123,738 = 123,738/x
3. Step 3: Cross multiply
   81,990x = 123,738 × 123,738
4. Step 4: Simplify right side
   81,990x = 15,311,092,644
5. Step 5: Solve for x
   x = 15,311,092,644/81,990
6. Step 6: Final answer
   x = 186,743.42