Finding the Third Proportional to 688,208 and 1,036,290

Step by Step Solution

1. Step 1: Write the proportion equation
   688,208 : 1,036,290 = 1,036,290 : x
2. Step 2: Convert to fraction form
   688,208/1,036,290 = 1,036,290/x
3. Step 3: Cross multiply
   688,208x = 1,036,290 × 1,036,290
4. Step 4: Simplify right side
   688,208x = 1,073,896,964,100
5. Step 5: Solve for x
   x = 1,073,896,964,100/688,208
6. Step 6: Final answer
   x = 1,560,424.99