Finding the Third Proportional to 1,286,980 and 1,692,390

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286,980 : 1,692,390 = 1,692,390 : x
2. Step 2: Convert to fraction form
   1,286,980/1,692,390 = 1,692,390/x
3. Step 3: Cross multiply
   1,286,980x = 1,692,390 × 1,692,390
4. Step 4: Simplify right side
   1,286,980x = 2,864,183,912,100
5. Step 5: Solve for x
   x = 2,864,183,912,100/1,286,980
6. Step 6: Final answer
   x = 2,225,507.71