Finding the Third Proportional to 621,738 and 1,228,920

Step by Step Solution

1. Step 1: Write the proportion equation
   621,738 : 1,228,920 = 1,228,920 : x
2. Step 2: Convert to fraction form
   621,738/1,228,920 = 1,228,920/x
3. Step 3: Cross multiply
   621,738x = 1,228,920 × 1,228,920
4. Step 4: Simplify right side
   621,738x = 1,510,244,366,400
5. Step 5: Solve for x
   x = 1,510,244,366,400/621,738
6. Step 6: Final answer
   x = 2,429,068.78