Finding the Third Proportional to 1,223,817 and 1,720,360

Step by Step Solution

1. Step 1: Write the proportion equation
   1,223,817 : 1,720,360 = 1,720,360 : x
2. Step 2: Convert to fraction form
   1,223,817/1,720,360 = 1,720,360/x
3. Step 3: Cross multiply
   1,223,817x = 1,720,360 × 1,720,360
4. Step 4: Simplify right side
   1,223,817x = 2,959,638,529,600
5. Step 5: Solve for x
   x = 2,959,638,529,600/1,223,817
6. Step 6: Final answer
   x = 2,418,366.90