Finding the Third Proportional to 143,645 and 308,458

Step by Step Solution

1. Step 1: Write the proportion equation
   143,645 : 308,458 = 308,458 : x
2. Step 2: Convert to fraction form
   143,645/308,458 = 308,458/x
3. Step 3: Cross multiply
   143,645x = 308,458 × 308,458
4. Step 4: Simplify right side
   143,645x = 95,146,337,764
5. Step 5: Solve for x
   x = 95,146,337,764/143,645
6. Step 6: Final answer
   x = 662,371.39