Finding the Third Proportional to 172,809 and 359,416.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172,809 : 359,416.50 = 359,416.50 : x
2. Step 2: Convert to fraction form
   172,809/359,416.50 = 359,416.50/x
3. Step 3: Cross multiply
   172,809x = 359,416.50 × 359,416.50
4. Step 4: Simplify right side
   172,809x = 129,180,220,472.25
5. Step 5: Solve for x
   x = 129,180,220,472.25/172,809
6. Step 6: Final answer
   x = 747,531.79