Finding the Third Proportional to 688,666 and 1,487,988

Step by Step Solution

1. Step 1: Write the proportion equation
   688,666 : 1,487,988 = 1,487,988 : x
2. Step 2: Convert to fraction form
   688,666/1,487,988 = 1,487,988/x
3. Step 3: Cross multiply
   688,666x = 1,487,988 × 1,487,988
4. Step 4: Simplify right side
   688,666x = 2,214,108,288,144
5. Step 5: Solve for x
   x = 2,214,108,288,144/688,666
6. Step 6: Final answer
   x = 3,215,068.39