Finding the Third Proportional to 131,612 and 289,460

Step by Step Solution

1. Step 1: Write the proportion equation
   131,612 : 289,460 = 289,460 : x
2. Step 2: Convert to fraction form
   131,612/289,460 = 289,460/x
3. Step 3: Cross multiply
   131,612x = 289,460 × 289,460
4. Step 4: Simplify right side
   131,612x = 83,787,091,600
5. Step 5: Solve for x
   x = 83,787,091,600/131,612
6. Step 6: Final answer
   x = 636,621.98