Finding the Third Proportional to 368,694,590 and 789,978,426

Step by Step Solution

1. Step 1: Write the proportion equation
   368,694,590 : 789,978,426 = 789,978,426 : x
2. Step 2: Convert to fraction form
   368,694,590/789,978,426 = 789,978,426/x
3. Step 3: Cross multiply
   368,694,590x = 789,978,426 × 789,978,426
4. Step 4: Simplify right side
   368,694,590x = 624,065,913,545,437,440
5. Step 5: Solve for x
   x = 624,065,913,545,437,440/368,694,590
6. Step 6: Final answer
   x = 1,692,636,481.45