Finding the Third Proportional to 1,312,220 and 2,142,720

Step by Step Solution

1. Step 1: Write the proportion equation
   1,312,220 : 2,142,720 = 2,142,720 : x
2. Step 2: Convert to fraction form
   1,312,220/2,142,720 = 2,142,720/x
3. Step 3: Cross multiply
   1,312,220x = 2,142,720 × 2,142,720
4. Step 4: Simplify right side
   1,312,220x = 4,591,248,998,400
5. Step 5: Solve for x
   x = 4,591,248,998,400/1,312,220
6. Step 6: Final answer
   x = 3,498,840.89