Finding the Third Proportional to 143,310 and 309,968

Step by Step Solution

1. Step 1: Write the proportion equation
   143,310 : 309,968 = 309,968 : x
2. Step 2: Convert to fraction form
   143,310/309,968 = 309,968/x
3. Step 3: Cross multiply
   143,310x = 309,968 × 309,968
4. Step 4: Simplify right side
   143,310x = 96,080,161,024
5. Step 5: Solve for x
   x = 96,080,161,024/143,310
6. Step 6: Final answer
   x = 670,435.85