Finding the Third Proportional to 215,256 and 424,992

Step by Step Solution

1. Step 1: Write the proportion equation
   215,256 : 424,992 = 424,992 : x
2. Step 2: Convert to fraction form
   215,256/424,992 = 424,992/x
3. Step 3: Cross multiply
   215,256x = 424,992 × 424,992
4. Step 4: Simplify right side
   215,256x = 180,618,200,064
5. Step 5: Solve for x
   x = 180,618,200,064/215,256
6. Step 6: Final answer
   x = 839,085.55