Finding the Third Proportional to 911,138 and 1,389,171

Step by Step Solution

1. Step 1: Write the proportion equation
   911,138 : 1,389,171 = 1,389,171 : x
2. Step 2: Convert to fraction form
   911,138/1,389,171 = 1,389,171/x
3. Step 3: Cross multiply
   911,138x = 1,389,171 × 1,389,171
4. Step 4: Simplify right side
   911,138x = 1,929,796,067,241
5. Step 5: Solve for x
   x = 1,929,796,067,241/911,138
6. Step 6: Final answer
   x = 2,118,006.35