Finding the Third Proportional to 172,890 and 359,550

Step by Step Solution

1. Step 1: Write the proportion equation
   172,890 : 359,550 = 359,550 : x
2. Step 2: Convert to fraction form
   172,890/359,550 = 359,550/x
3. Step 3: Cross multiply
   172,890x = 359,550 × 359,550
4. Step 4: Simplify right side
   172,890x = 129,276,202,500
5. Step 5: Solve for x
   x = 129,276,202,500/172,890
6. Step 6: Final answer
   x = 747,736.73