Finding the Third Proportional to 1,431,639 and 3,115,188

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431,639 : 3,115,188 = 3,115,188 : x
2. Step 2: Convert to fraction form
   1,431,639/3,115,188 = 3,115,188/x
3. Step 3: Cross multiply
   1,431,639x = 3,115,188 × 3,115,188
4. Step 4: Simplify right side
   1,431,639x = 9,704,396,275,344
5. Step 5: Solve for x
   x = 9,704,396,275,344/1,431,639
6. Step 6: Final answer
   x = 6,778,521.87