Finding the Third Proportional to 1,388,678 and 2,860,428

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,678 : 2,860,428 = 2,860,428 : x
2. Step 2: Convert to fraction form
   1,388,678/2,860,428 = 2,860,428/x
3. Step 3: Cross multiply
   1,388,678x = 2,860,428 × 2,860,428
4. Step 4: Simplify right side
   1,388,678x = 8,182,048,343,184
5. Step 5: Solve for x
   x = 8,182,048,343,184/1,388,678
6. Step 6: Final answer
   x = 5,891,969.44