Finding the Third Proportional to 342,956.50 and 489,212

Step by Step Solution

1. Step 1: Write the proportion equation
   342,956.50 : 489,212 = 489,212 : x
2. Step 2: Convert to fraction form
   342,956.50/489,212 = 489,212/x
3. Step 3: Cross multiply
   342,956.50x = 489,212 × 489,212
4. Step 4: Simplify right side
   342,956.50x = 239,328,380,944
5. Step 5: Solve for x
   x = 239,328,380,944/342,956.50
6. Step 6: Final answer
   x = 697,838.88