Finding the Third Proportional to 129,892 and 200,310

Step by Step Solution

1. Step 1: Write the proportion equation
   129,892 : 200,310 = 200,310 : x
2. Step 2: Convert to fraction form
   129,892/200,310 = 200,310/x
3. Step 3: Cross multiply
   129,892x = 200,310 × 200,310
4. Step 4: Simplify right side
   129,892x = 40,124,096,100
5. Step 5: Solve for x
   x = 40,124,096,100/129,892
6. Step 6: Final answer
   x = 308,903.52