Finding the Third Proportional to 402,870 and 877,665

Step by Step Solution

1. Step 1: Write the proportion equation
   402,870 : 877,665 = 877,665 : x
2. Step 2: Convert to fraction form
   402,870/877,665 = 877,665/x
3. Step 3: Cross multiply
   402,870x = 877,665 × 877,665
4. Step 4: Simplify right side
   402,870x = 770,295,852,225
5. Step 5: Solve for x
   x = 770,295,852,225/402,870
6. Step 6: Final answer
   x = 1,912,020.88