Finding the Third Proportional to 212,470 and 489,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   212,470 : 489,308.50 = 489,308.50 : x
2. Step 2: Convert to fraction form
   212,470/489,308.50 = 489,308.50/x
3. Step 3: Cross multiply
   212,470x = 489,308.50 × 489,308.50
4. Step 4: Simplify right side
   212,470x = 239,422,808,172.25
5. Step 5: Solve for x
   x = 239,422,808,172.25/212,470
6. Step 6: Final answer
   x = 1,126,854.65