Finding the Third Proportional to 149,839.88 and 321,003

Step by Step Solution

1. Step 1: Write the proportion equation
   149,839.88 : 321,003 = 321,003 : x
2. Step 2: Convert to fraction form
   149,839.88/321,003 = 321,003/x
3. Step 3: Cross multiply
   149,839.88x = 321,003 × 321,003
4. Step 4: Simplify right side
   149,839.88x = 103,042,926,009
5. Step 5: Solve for x
   x = 103,042,926,009/149,839.88
6. Step 6: Final answer
   x = 687,686.95