Finding the Third Proportional to 394,170 and 864,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   394,170 : 864,643.50 = 864,643.50 : x
2. Step 2: Convert to fraction form
   394,170/864,643.50 = 864,643.50/x
3. Step 3: Cross multiply
   394,170x = 864,643.50 × 864,643.50
4. Step 4: Simplify right side
   394,170x = 747,608,382,092.25
5. Step 5: Solve for x
   x = 747,608,382,092.25/394,170
6. Step 6: Final answer
   x = 1,896,664.85