Finding the Third Proportional to 142,074 and 212,139

Step by Step Solution

1. Step 1: Write the proportion equation
   142,074 : 212,139 = 212,139 : x
2. Step 2: Convert to fraction form
   142,074/212,139 = 212,139/x
3. Step 3: Cross multiply
   142,074x = 212,139 × 212,139
4. Step 4: Simplify right side
   142,074x = 45,002,955,321
5. Step 5: Solve for x
   x = 45,002,955,321/142,074
6. Step 6: Final answer
   x = 316,757.15