Finding the Third Proportional to 143,228 and 311,320

Step by Step Solution

1. Step 1: Write the proportion equation
   143,228 : 311,320 = 311,320 : x
2. Step 2: Convert to fraction form
   143,228/311,320 = 311,320/x
3. Step 3: Cross multiply
   143,228x = 311,320 × 311,320
4. Step 4: Simplify right side
   143,228x = 96,920,142,400
5. Step 5: Solve for x
   x = 96,920,142,400/143,228
6. Step 6: Final answer
   x = 676,684.32