Finding the Third Proportional to 638,088,816 and 1,388,152,032

Step by Step Solution

1. Step 1: Write the proportion equation
   638,088,816 : 1,388,152,032 = 1,388,152,032 : x
2. Step 2: Convert to fraction form
   638,088,816/1,388,152,032 = 1,388,152,032/x
3. Step 3: Cross multiply
   638,088,816x = 1,388,152,032 × 1,388,152,032
4. Step 4: Simplify right side
   638,088,816x = 1,926,966,063,945,729,024
5. Step 5: Solve for x
   x = 1,926,966,063,945,729,024/638,088,816
6. Step 6: Final answer
   x = 3,019,902,583.51