Finding the Third Proportional to 617,880 and 1,338,519

Step by Step Solution

1. Step 1: Write the proportion equation
   617,880 : 1,338,519 = 1,338,519 : x
2. Step 2: Convert to fraction form
   617,880/1,338,519 = 1,338,519/x
3. Step 3: Cross multiply
   617,880x = 1,338,519 × 1,338,519
4. Step 4: Simplify right side
   617,880x = 1,791,633,113,361
5. Step 5: Solve for x
   x = 1,791,633,113,361/617,880
6. Step 6: Final answer
   x = 2,899,645.75