Finding the Third Proportional to 1,390,216 and 2,149,166

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390,216 : 2,149,166 = 2,149,166 : x
2. Step 2: Convert to fraction form
   1,390,216/2,149,166 = 2,149,166/x
3. Step 3: Cross multiply
   1,390,216x = 2,149,166 × 2,149,166
4. Step 4: Simplify right side
   1,390,216x = 4,618,914,495,556
5. Step 5: Solve for x
   x = 4,618,914,495,556/1,390,216
6. Step 6: Final answer
   x = 3,322,443.78