Finding the Third Proportional to 818,436 and 1,240,290

Step by Step Solution

1. Step 1: Write the proportion equation
   818,436 : 1,240,290 = 1,240,290 : x
2. Step 2: Convert to fraction form
   818,436/1,240,290 = 1,240,290/x
3. Step 3: Cross multiply
   818,436x = 1,240,290 × 1,240,290
4. Step 4: Simplify right side
   818,436x = 1,538,319,284,100
5. Step 5: Solve for x
   x = 1,538,319,284,100/818,436
6. Step 6: Final answer
   x = 1,879,584.09