Finding the Third Proportional to 392,870 and 857,708

Step by Step Solution

1. Step 1: Write the proportion equation
   392,870 : 857,708 = 857,708 : x
2. Step 2: Convert to fraction form
   392,870/857,708 = 857,708/x
3. Step 3: Cross multiply
   392,870x = 857,708 × 857,708
4. Step 4: Simplify right side
   392,870x = 735,663,013,264
5. Step 5: Solve for x
   x = 735,663,013,264/392,870
6. Step 6: Final answer
   x = 1,872,535.48