Finding the Third Proportional to 149,500 and 321,188

Step by Step Solution

1. Step 1: Write the proportion equation
   149,500 : 321,188 = 321,188 : x
2. Step 2: Convert to fraction form
   149,500/321,188 = 321,188/x
3. Step 3: Cross multiply
   149,500x = 321,188 × 321,188
4. Step 4: Simplify right side
   149,500x = 103,161,731,344
5. Step 5: Solve for x
   x = 103,161,731,344/149,500
6. Step 6: Final answer
   x = 690,045.03