Finding the Third Proportional to 156,664.50 and 321,624

Step by Step Solution

1. Step 1: Write the proportion equation
   156,664.50 : 321,624 = 321,624 : x
2. Step 2: Convert to fraction form
   156,664.50/321,624 = 321,624/x
3. Step 3: Cross multiply
   156,664.50x = 321,624 × 321,624
4. Step 4: Simplify right side
   156,664.50x = 103,441,997,376
5. Step 5: Solve for x
   x = 103,441,997,376/156,664.50
6. Step 6: Final answer
   x = 660,277.20