Finding the Third Proportional to 402,361 and 870,059

Step by Step Solution

1. Step 1: Write the proportion equation
   402,361 : 870,059 = 870,059 : x
2. Step 2: Convert to fraction form
   402,361/870,059 = 870,059/x
3. Step 3: Cross multiply
   402,361x = 870,059 × 870,059
4. Step 4: Simplify right side
   402,361x = 757,002,663,481
5. Step 5: Solve for x
   x = 757,002,663,481/402,361
6. Step 6: Final answer
   x = 1,881,401.69