Finding the Third Proportional to 129,288 and 200,898

Step by Step Solution

1. Step 1: Write the proportion equation
   129,288 : 200,898 = 200,898 : x
2. Step 2: Convert to fraction form
   129,288/200,898 = 200,898/x
3. Step 3: Cross multiply
   129,288x = 200,898 × 200,898
4. Step 4: Simplify right side
   129,288x = 40,360,006,404
5. Step 5: Solve for x
   x = 40,360,006,404/129,288
6. Step 6: Final answer
   x = 312,171.33