Finding the Third Proportional to 1,640,289 and 2,208,144

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640,289 : 2,208,144 = 2,208,144 : x
2. Step 2: Convert to fraction form
   1,640,289/2,208,144 = 2,208,144/x
3. Step 3: Cross multiply
   1,640,289x = 2,208,144 × 2,208,144
4. Step 4: Simplify right side
   1,640,289x = 4,875,899,924,736
5. Step 5: Solve for x
   x = 4,875,899,924,736/1,640,289
6. Step 6: Final answer
   x = 2,972,585.88