Finding the Third Proportional to 144,810 and 309,870

Step by Step Solution

1. Step 1: Write the proportion equation
   144,810 : 309,870 = 309,870 : x
2. Step 2: Convert to fraction form
   144,810/309,870 = 309,870/x
3. Step 3: Cross multiply
   144,810x = 309,870 × 309,870
4. Step 4: Simplify right side
   144,810x = 96,019,416,900
5. Step 5: Solve for x
   x = 96,019,416,900/144,810
6. Step 6: Final answer
   x = 663,071.73