Finding the Third Proportional to 866,436 and 1,338,990

Step by Step Solution

1. Step 1: Write the proportion equation
   866,436 : 1,338,990 = 1,338,990 : x
2. Step 2: Convert to fraction form
   866,436/1,338,990 = 1,338,990/x
3. Step 3: Cross multiply
   866,436x = 1,338,990 × 1,338,990
4. Step 4: Simplify right side
   866,436x = 1,792,894,220,100
5. Step 5: Solve for x
   x = 1,792,894,220,100/866,436
6. Step 6: Final answer
   x = 2,069,274.85