Finding the Third Proportional to 678,388 and 1,474,688

Step by Step Solution

1. Step 1: Write the proportion equation
   678,388 : 1,474,688 = 1,474,688 : x
2. Step 2: Convert to fraction form
   678,388/1,474,688 = 1,474,688/x
3. Step 3: Cross multiply
   678,388x = 1,474,688 × 1,474,688
4. Step 4: Simplify right side
   678,388x = 2,174,704,697,344
5. Step 5: Solve for x
   x = 2,174,704,697,344/678,388
6. Step 6: Final answer
   x = 3,205,694.52