Finding the Third Proportional to 685,440 and 1,054,272

Step by Step Solution

1. Step 1: Write the proportion equation
   685,440 : 1,054,272 = 1,054,272 : x
2. Step 2: Convert to fraction form
   685,440/1,054,272 = 1,054,272/x
3. Step 3: Cross multiply
   685,440x = 1,054,272 × 1,054,272
4. Step 4: Simplify right side
   685,440x = 1,111,489,449,984
5. Step 5: Solve for x
   x = 1,111,489,449,984/685,440
6. Step 6: Final answer
   x = 1,621,570.74