Finding the Third Proportional to 245,796 and 390,834

Step by Step Solution

1. Step 1: Write the proportion equation
   245,796 : 390,834 = 390,834 : x
2. Step 2: Convert to fraction form
   245,796/390,834 = 390,834/x
3. Step 3: Cross multiply
   245,796x = 390,834 × 390,834
4. Step 4: Simplify right side
   245,796x = 152,751,215,556
5. Step 5: Solve for x
   x = 152,751,215,556/245,796
6. Step 6: Final answer
   x = 621,455.25