Finding the Third Proportional to 149,205,921.50 and 321,086,666

Step by Step Solution

1. Step 1: Write the proportion equation
   149,205,921.50 : 321,086,666 = 321,086,666 : x
2. Step 2: Convert to fraction form
   149,205,921.50/321,086,666 = 321,086,666/x
3. Step 3: Cross multiply
   149,205,921.50x = 321,086,666 × 321,086,666
4. Step 4: Simplify right side
   149,205,921.50x = 103,096,647,082,995,552
5. Step 5: Solve for x
   x = 103,096,647,082,995,552/149,205,921.50
6. Step 6: Final answer
   x = 690,968,870.72