Finding the Third Proportional to 439,634,644 and 680,111,772

Step by Step Solution

1. Step 1: Write the proportion equation
   439,634,644 : 680,111,772 = 680,111,772 : x
2. Step 2: Convert to fraction form
   439,634,644/680,111,772 = 680,111,772/x
3. Step 3: Cross multiply
   439,634,644x = 680,111,772 × 680,111,772
4. Step 4: Simplify right side
   439,634,644x = 462,552,022,412,979,968
5. Step 5: Solve for x
   x = 462,552,022,412,979,968/439,634,644
6. Step 6: Final answer
   x = 1,052,128,235.86