Finding the Third Proportional to 1,388,724 and 2,164,272

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388,724 : 2,164,272 = 2,164,272 : x
2. Step 2: Convert to fraction form
   1,388,724/2,164,272 = 2,164,272/x
3. Step 3: Cross multiply
   1,388,724x = 2,164,272 × 2,164,272
4. Step 4: Simplify right side
   1,388,724x = 4,684,073,289,984
5. Step 5: Solve for x
   x = 4,684,073,289,984/1,388,724
6. Step 6: Final answer
   x = 3,372,933.20