Finding the Third Proportional to 688,665 and 1,487,986

Step by Step Solution

1. Step 1: Write the proportion equation
   688,665 : 1,487,986 = 1,487,986 : x
2. Step 2: Convert to fraction form
   688,665/1,487,986 = 1,487,986/x
3. Step 3: Cross multiply
   688,665x = 1,487,986 × 1,487,986
4. Step 4: Simplify right side
   688,665x = 2,214,102,336,196
5. Step 5: Solve for x
   x = 2,214,102,336,196/688,665
6. Step 6: Final answer
   x = 3,215,064.42