Finding the Third Proportional to 140,154 and 315,393

Step by Step Solution

1. Step 1: Write the proportion equation
   140,154 : 315,393 = 315,393 : x
2. Step 2: Convert to fraction form
   140,154/315,393 = 315,393/x
3. Step 3: Cross multiply
   140,154x = 315,393 × 315,393
4. Step 4: Simplify right side
   140,154x = 99,472,744,449
5. Step 5: Solve for x
   x = 99,472,744,449/140,154
6. Step 6: Final answer
   x = 709,738.89