Finding the Third Proportional to 143,496 and 315,288

Step by Step Solution

1. Step 1: Write the proportion equation
   143,496 : 315,288 = 315,288 : x
2. Step 2: Convert to fraction form
   143,496/315,288 = 315,288/x
3. Step 3: Cross multiply
   143,496x = 315,288 × 315,288
4. Step 4: Simplify right side
   143,496x = 99,406,522,944
5. Step 5: Solve for x
   x = 99,406,522,944/143,496
6. Step 6: Final answer
   x = 692,747.69