Finding the Third Proportional to 143,139 and 210,330

Step by Step Solution

1. Step 1: Write the proportion equation
   143,139 : 210,330 = 210,330 : x
2. Step 2: Convert to fraction form
   143,139/210,330 = 210,330/x
3. Step 3: Cross multiply
   143,139x = 210,330 × 210,330
4. Step 4: Simplify right side
   143,139x = 44,238,708,900
5. Step 5: Solve for x
   x = 44,238,708,900/143,139
6. Step 6: Final answer
   x = 309,061.18