Finding the Third Proportional to 142,079 and 212,146

Step by Step Solution

1. Step 1: Write the proportion equation
   142,079 : 212,146 = 212,146 : x
2. Step 2: Convert to fraction form
   142,079/212,146 = 212,146/x
3. Step 3: Cross multiply
   142,079x = 212,146 × 212,146
4. Step 4: Simplify right side
   142,079x = 45,005,925,316
5. Step 5: Solve for x
   x = 45,005,925,316/142,079
6. Step 6: Final answer
   x = 316,766.91