Finding the Third Proportional to 865,215 and 1,858,410

Step by Step Solution

1. Step 1: Write the proportion equation
   865,215 : 1,858,410 = 1,858,410 : x
2. Step 2: Convert to fraction form
   865,215/1,858,410 = 1,858,410/x
3. Step 3: Cross multiply
   865,215x = 1,858,410 × 1,858,410
4. Step 4: Simplify right side
   865,215x = 3,453,687,728,100
5. Step 5: Solve for x
   x = 3,453,687,728,100/865,215
6. Step 6: Final answer
   x = 3,991,710.42