Finding the Third Proportional to 142,112 and 212,192

Step by Step Solution

1. Step 1: Write the proportion equation
   142,112 : 212,192 = 212,192 : x
2. Step 2: Convert to fraction form
   142,112/212,192 = 212,192/x
3. Step 3: Cross multiply
   142,112x = 212,192 × 212,192
4. Step 4: Simplify right side
   142,112x = 45,025,444,864
5. Step 5: Solve for x
   x = 45,025,444,864/142,112
6. Step 6: Final answer
   x = 316,830.70