Finding the Third Proportional to 640,272 and 1,398,624

Step by Step Solution

1. Step 1: Write the proportion equation
   640,272 : 1,398,624 = 1,398,624 : x
2. Step 2: Convert to fraction form
   640,272/1,398,624 = 1,398,624/x
3. Step 3: Cross multiply
   640,272x = 1,398,624 × 1,398,624
4. Step 4: Simplify right side
   640,272x = 1,956,149,093,376
5. Step 5: Solve for x
   x = 1,956,149,093,376/640,272
6. Step 6: Final answer
   x = 3,055,184.50