Finding the Third Proportional to 144,262 and 315,074

Step by Step Solution

1. Step 1: Write the proportion equation
   144,262 : 315,074 = 315,074 : x
2. Step 2: Convert to fraction form
   144,262/315,074 = 315,074/x
3. Step 3: Cross multiply
   144,262x = 315,074 × 315,074
4. Step 4: Simplify right side
   144,262x = 99,271,625,476
5. Step 5: Solve for x
   x = 99,271,625,476/144,262
6. Step 6: Final answer
   x = 688,134.27