Finding the Third Proportional to 144,429 and 315,102

Step by Step Solution

1. Step 1: Write the proportion equation
   144,429 : 315,102 = 315,102 : x
2. Step 2: Convert to fraction form
   144,429/315,102 = 315,102/x
3. Step 3: Cross multiply
   144,429x = 315,102 × 315,102
4. Step 4: Simplify right side
   144,429x = 99,289,270,404
5. Step 5: Solve for x
   x = 99,289,270,404/144,429
6. Step 6: Final answer
   x = 687,460.76