Finding the Third Proportional to 81,510 and 123,931

Step by Step Solution

1. Step 1: Write the proportion equation
   81,510 : 123,931 = 123,931 : x
2. Step 2: Convert to fraction form
   81,510/123,931 = 123,931/x
3. Step 3: Cross multiply
   81,510x = 123,931 × 123,931
4. Step 4: Simplify right side
   81,510x = 15,358,892,761
5. Step 5: Solve for x
   x = 15,358,892,761/81,510
6. Step 6: Final answer
   x = 188,429.55