Finding the Third Proportional to 401,632 and 856,640

Step by Step Solution

1. Step 1: Write the proportion equation
   401,632 : 856,640 = 856,640 : x
2. Step 2: Convert to fraction form
   401,632/856,640 = 856,640/x
3. Step 3: Cross multiply
   401,632x = 856,640 × 856,640
4. Step 4: Simplify right side
   401,632x = 733,832,089,600
5. Step 5: Solve for x
   x = 733,832,089,600/401,632
6. Step 6: Final answer
   x = 1,827,125.55