Finding the Third Proportional to 156,459 and 321,211.50

Step by Step Solution

1. Step 1: Write the proportion equation
   156,459 : 321,211.50 = 321,211.50 : x
2. Step 2: Convert to fraction form
   156,459/321,211.50 = 321,211.50/x
3. Step 3: Cross multiply
   156,459x = 321,211.50 × 321,211.50
4. Step 4: Simplify right side
   156,459x = 103,176,827,732.25
5. Step 5: Solve for x
   x = 103,176,827,732.25/156,459
6. Step 6: Final answer
   x = 659,449.62