Finding the Third Proportional to 640,216 and 1,375,320

Step by Step Solution

1. Step 1: Write the proportion equation
   640,216 : 1,375,320 = 1,375,320 : x
2. Step 2: Convert to fraction form
   640,216/1,375,320 = 1,375,320/x
3. Step 3: Cross multiply
   640,216x = 1,375,320 × 1,375,320
4. Step 4: Simplify right side
   640,216x = 1,891,505,102,400
5. Step 5: Solve for x
   x = 1,891,505,102,400/640,216
6. Step 6: Final answer
   x = 2,954,479.59