Finding the Third Proportional to 81,808,911 and 123,561,728

Step by Step Solution

1. Step 1: Write the proportion equation
   81,808,911 : 123,561,728 = 123,561,728 : x
2. Step 2: Convert to fraction form
   81,808,911/123,561,728 = 123,561,728/x
3. Step 3: Cross multiply
   81,808,911x = 123,561,728 × 123,561,728
4. Step 4: Simplify right side
   81,808,911x = 15,267,500,626,345,984
5. Step 5: Solve for x
   x = 15,267,500,626,345,984/81,808,911
6. Step 6: Final answer
   x = 186,623,931.79