Finding the Third Proportional to 245,422,212 and 390,703,650

Step by Step Solution

1. Step 1: Write the proportion equation
   245,422,212 : 390,703,650 = 390,703,650 : x
2. Step 2: Convert to fraction form
   245,422,212/390,703,650 = 390,703,650/x
3. Step 3: Cross multiply
   245,422,212x = 390,703,650 × 390,703,650
4. Step 4: Simplify right side
   245,422,212x = 152,649,342,123,322,496
5. Step 5: Solve for x
   x = 152,649,342,123,322,496/245,422,212
6. Step 6: Final answer
   x = 621,986,660.78