Finding the Third Proportional to 400,670 and 864,540

Step by Step Solution

1. Step 1: Write the proportion equation
   400,670 : 864,540 = 864,540 : x
2. Step 2: Convert to fraction form
   400,670/864,540 = 864,540/x
3. Step 3: Cross multiply
   400,670x = 864,540 × 864,540
4. Step 4: Simplify right side
   400,670x = 747,429,411,600
5. Step 5: Solve for x
   x = 747,429,411,600/400,670
6. Step 6: Final answer
   x = 1,865,448.90