Finding the Third Proportional to 1,223,870 and 1,720,431

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223,870 : 1,720,431 = 1,720,431 : x
2. Step 2: Convert to fraction form
   1,223,870/1,720,431 = 1,720,431/x
3. Step 3: Cross multiply
   1,223,870x = 1,720,431 × 1,720,431
4. Step 4: Simplify right side
   1,223,870x = 2,959,882,825,761
5. Step 5: Solve for x
   x = 2,959,882,825,761/1,223,870
6. Step 6: Final answer
   x = 2,418,461.79