Finding the Third Proportional to 1,388,694 and 2,164,239

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,694 : 2,164,239 = 2,164,239 : x
2. Step 2: Convert to fraction form
   1,388,694/2,164,239 = 2,164,239/x
3. Step 3: Cross multiply
   1,388,694x = 2,164,239 × 2,164,239
4. Step 4: Simplify right side
   1,388,694x = 4,683,930,449,121
5. Step 5: Solve for x
   x = 4,683,930,449,121/1,388,694
6. Step 6: Final answer
   x = 3,372,903.21