Finding the Third Proportional to 678,978 and 1,488,528

Step by Step Solution

1. Step 1: Write the proportion equation
   678,978 : 1,488,528 = 1,488,528 : x
2. Step 2: Convert to fraction form
   678,978/1,488,528 = 1,488,528/x
3. Step 3: Cross multiply
   678,978x = 1,488,528 × 1,488,528
4. Step 4: Simplify right side
   678,978x = 2,215,715,606,784
5. Step 5: Solve for x
   x = 2,215,715,606,784/678,978
6. Step 6: Final answer
   x = 3,263,309.87