Finding the Third Proportional to 688,390 and 1,491,166

Step by Step Solution

1. Step 1: Write the proportion equation
   688,390 : 1,491,166 = 1,491,166 : x
2. Step 2: Convert to fraction form
   688,390/1,491,166 = 1,491,166/x
3. Step 3: Cross multiply
   688,390x = 1,491,166 × 1,491,166
4. Step 4: Simplify right side
   688,390x = 2,223,576,039,556
5. Step 5: Solve for x
   x = 2,223,576,039,556/688,390
6. Step 6: Final answer
   x = 3,230,110.90