Finding the Third Proportional to 142,510 and 311,264

Step by Step Solution

1. Step 1: Write the proportion equation
   142,510 : 311,264 = 311,264 : x
2. Step 2: Convert to fraction form
   142,510/311,264 = 311,264/x
3. Step 3: Cross multiply
   142,510x = 311,264 × 311,264
4. Step 4: Simplify right side
   142,510x = 96,885,277,696
5. Step 5: Solve for x
   x = 96,885,277,696/142,510
6. Step 6: Final answer
   x = 679,848.98