Finding the Third Proportional to 1,388,682 and 2,164,221

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,682 : 2,164,221 = 2,164,221 : x
2. Step 2: Convert to fraction form
   1,388,682/2,164,221 = 2,164,221/x
3. Step 3: Cross multiply
   1,388,682x = 2,164,221 × 2,164,221
4. Step 4: Simplify right side
   1,388,682x = 4,683,852,536,841
5. Step 5: Solve for x
   x = 4,683,852,536,841/1,388,682
6. Step 6: Final answer
   x = 3,372,876.25