Finding the Third Proportional to 1,388,142 and 2,099,708

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,142 : 2,099,708 = 2,099,708 : x
2. Step 2: Convert to fraction form
   1,388,142/2,099,708 = 2,099,708/x
3. Step 3: Cross multiply
   1,388,142x = 2,099,708 × 2,099,708
4. Step 4: Simplify right side
   1,388,142x = 4,408,773,685,264
5. Step 5: Solve for x
   x = 4,408,773,685,264/1,388,142
6. Step 6: Final answer
   x = 3,176,024.99