Finding the Third Proportional to 388,870 and 852,490

Step by Step Solution

1. Step 1: Write the proportion equation
   388,870 : 852,490 = 852,490 : x
2. Step 2: Convert to fraction form
   388,870/852,490 = 852,490/x
3. Step 3: Cross multiply
   388,870x = 852,490 × 852,490
4. Step 4: Simplify right side
   388,870x = 726,739,200,100
5. Step 5: Solve for x
   x = 726,739,200,100/388,870
6. Step 6: Final answer
   x = 1,868,848.72