Finding the Third Proportional to 264,870 and 397,890

Step by Step Solution

1. Step 1: Write the proportion equation
   264,870 : 397,890 = 397,890 : x
2. Step 2: Convert to fraction form
   264,870/397,890 = 397,890/x
3. Step 3: Cross multiply
   264,870x = 397,890 × 397,890
4. Step 4: Simplify right side
   264,870x = 158,316,452,100
5. Step 5: Solve for x
   x = 158,316,452,100/264,870
6. Step 6: Final answer
   x = 597,713.79