Finding the Third Proportional to 890,390 and 1,379,561

Step by Step Solution

1. Step 1: Write the proportion equation
   890,390 : 1,379,561 = 1,379,561 : x
2. Step 2: Convert to fraction form
   890,390/1,379,561 = 1,379,561/x
3. Step 3: Cross multiply
   890,390x = 1,379,561 × 1,379,561
4. Step 4: Simplify right side
   890,390x = 1,903,188,552,721
5. Step 5: Solve for x
   x = 1,903,188,552,721/890,390
6. Step 6: Final answer
   x = 2,137,477.46