Finding the Third Proportional to 306,870 and 656,384

Step by Step Solution

1. Step 1: Write the proportion equation
   306,870 : 656,384 = 656,384 : x
2. Step 2: Convert to fraction form
   306,870/656,384 = 656,384/x
3. Step 3: Cross multiply
   306,870x = 656,384 × 656,384
4. Step 4: Simplify right side
   306,870x = 430,839,955,456
5. Step 5: Solve for x
   x = 430,839,955,456/306,870
6. Step 6: Final answer
   x = 1,403,982.00