Finding the Third Proportional to 687,367 and 1,509,221

Step by Step Solution

1. Step 1: Write the proportion equation
   687,367 : 1,509,221 = 1,509,221 : x
2. Step 2: Convert to fraction form
   687,367/1,509,221 = 1,509,221/x
3. Step 3: Cross multiply
   687,367x = 1,509,221 × 1,509,221
4. Step 4: Simplify right side
   687,367x = 2,277,748,026,841
5. Step 5: Solve for x
   x = 2,277,748,026,841/687,367
6. Step 6: Final answer
   x = 3,313,729.09