Finding the Third Proportional to 294,890,880 and 638,851,470

Step by Step Solution

1. Step 1: Write the proportion equation
   294,890,880 : 638,851,470 = 638,851,470 : x
2. Step 2: Convert to fraction form
   294,890,880/638,851,470 = 638,851,470/x
3. Step 3: Cross multiply
   294,890,880x = 638,851,470 × 638,851,470
4. Step 4: Simplify right side
   294,890,880x = 408,131,200,721,160,896
5. Step 5: Solve for x
   x = 408,131,200,721,160,896/294,890,880
6. Step 6: Final answer
   x = 1,384,007,537.71