Finding the Third Proportional to 143,770 and 309,348

Step by Step Solution

1. Step 1: Write the proportion equation
   143,770 : 309,348 = 309,348 : x
2. Step 2: Convert to fraction form
   143,770/309,348 = 309,348/x
3. Step 3: Cross multiply
   143,770x = 309,348 × 309,348
4. Step 4: Simplify right side
   143,770x = 95,696,185,104
5. Step 5: Solve for x
   x = 95,696,185,104/143,770
6. Step 6: Final answer
   x = 665,619.98