Finding the Third Proportional to 215,144 and 439,792

Step by Step Solution

1. Step 1: Write the proportion equation
   215,144 : 439,792 = 439,792 : x
2. Step 2: Convert to fraction form
   215,144/439,792 = 439,792/x
3. Step 3: Cross multiply
   215,144x = 439,792 × 439,792
4. Step 4: Simplify right side
   215,144x = 193,417,003,264
5. Step 5: Solve for x
   x = 193,417,003,264/215,144
6. Step 6: Final answer
   x = 899,011.84