Finding the Third Proportional to 143,186 and 309,970

Step by Step Solution

1. Step 1: Write the proportion equation
   143,186 : 309,970 = 309,970 : x
2. Step 2: Convert to fraction form
   143,186/309,970 = 309,970/x
3. Step 3: Cross multiply
   143,186x = 309,970 × 309,970
4. Step 4: Simplify right side
   143,186x = 96,081,400,900
5. Step 5: Solve for x
   x = 96,081,400,900/143,186
6. Step 6: Final answer
   x = 671,025.11