Finding the Third Proportional to 1,311,390 and 1,979,133

Step by Step Solution

1. Step 1: Write the proportion equation
   1,311,390 : 1,979,133 = 1,979,133 : x
2. Step 2: Convert to fraction form
   1,311,390/1,979,133 = 1,979,133/x
3. Step 3: Cross multiply
   1,311,390x = 1,979,133 × 1,979,133
4. Step 4: Simplify right side
   1,311,390x = 3,916,967,431,689
5. Step 5: Solve for x
   x = 3,916,967,431,689/1,311,390
6. Step 6: Final answer
   x = 2,986,882.19