Finding the Third Proportional to 62,609 and 139,215

Step by Step Solution

1. Step 1: Write the proportion equation
   62,609 : 139,215 = 139,215 : x
2. Step 2: Convert to fraction form
   62,609/139,215 = 139,215/x
3. Step 3: Cross multiply
   62,609x = 139,215 × 139,215
4. Step 4: Simplify right side
   62,609x = 19,380,816,225
5. Step 5: Solve for x
   x = 19,380,816,225/62,609
6. Step 6: Final answer
   x = 309,553.20