Finding the Third Proportional to 686,520 and 1,487,408

Step by Step Solution

1. Step 1: Write the proportion equation
   686,520 : 1,487,408 = 1,487,408 : x
2. Step 2: Convert to fraction form
   686,520/1,487,408 = 1,487,408/x
3. Step 3: Cross multiply
   686,520x = 1,487,408 × 1,487,408
4. Step 4: Simplify right side
   686,520x = 2,212,382,558,464
5. Step 5: Solve for x
   x = 2,212,382,558,464/686,520
6. Step 6: Final answer
   x = 3,222,604.67