Finding the Third Proportional to 81,510 and 123,930

Step by Step Solution

1. Step 1: Write the proportion equation
   81,510 : 123,930 = 123,930 : x
2. Step 2: Convert to fraction form
   81,510/123,930 = 123,930/x
3. Step 3: Cross multiply
   81,510x = 123,930 × 123,930
4. Step 4: Simplify right side
   81,510x = 15,358,644,900
5. Step 5: Solve for x
   x = 15,358,644,900/81,510
6. Step 6: Final answer
   x = 188,426.51