Finding the Third Proportional to 215,784 and 478,728

Step by Step Solution

1. Step 1: Write the proportion equation
   215,784 : 478,728 = 478,728 : x
2. Step 2: Convert to fraction form
   215,784/478,728 = 478,728/x
3. Step 3: Cross multiply
   215,784x = 478,728 × 478,728
4. Step 4: Simplify right side
   215,784x = 229,180,497,984
5. Step 5: Solve for x
   x = 229,180,497,984/215,784
6. Step 6: Final answer
   x = 1,062,082.91