Finding the Third Proportional to 687,040 and 1,090,272

Step by Step Solution

1. Step 1: Write the proportion equation
   687,040 : 1,090,272 = 1,090,272 : x
2. Step 2: Convert to fraction form
   687,040/1,090,272 = 1,090,272/x
3. Step 3: Cross multiply
   687,040x = 1,090,272 × 1,090,272
4. Step 4: Simplify right side
   687,040x = 1,188,693,033,984
5. Step 5: Solve for x
   x = 1,188,693,033,984/687,040
6. Step 6: Final answer
   x = 1,730,165.69