Finding the Third Proportional to 131,870 and 206,715

Step by Step Solution

1. Step 1: Write the proportion equation
   131,870 : 206,715 = 206,715 : x
2. Step 2: Convert to fraction form
   131,870/206,715 = 206,715/x
3. Step 3: Cross multiply
   131,870x = 206,715 × 206,715
4. Step 4: Simplify right side
   131,870x = 42,731,091,225
5. Step 5: Solve for x
   x = 42,731,091,225/131,870
6. Step 6: Final answer
   x = 324,039.52