Finding the Third Proportional to 143,643 and 308,454

Step by Step Solution

1. Step 1: Write the proportion equation
   143,643 : 308,454 = 308,454 : x
2. Step 2: Convert to fraction form
   143,643/308,454 = 308,454/x
3. Step 3: Cross multiply
   143,643x = 308,454 × 308,454
4. Step 4: Simplify right side
   143,643x = 95,143,870,116
5. Step 5: Solve for x
   x = 95,143,870,116/143,643
6. Step 6: Final answer
   x = 662,363.43