Finding the Third Proportional to 1,215,919 and 1,865,090

Step by Step Solution

1. Step 1: Write the proportion equation
   1,215,919 : 1,865,090 = 1,865,090 : x
2. Step 2: Convert to fraction form
   1,215,919/1,865,090 = 1,865,090/x
3. Step 3: Cross multiply
   1,215,919x = 1,865,090 × 1,865,090
4. Step 4: Simplify right side
   1,215,919x = 3,478,560,708,100
5. Step 5: Solve for x
   x = 3,478,560,708,100/1,215,919
6. Step 6: Final answer
   x = 2,860,849.04