Finding the Third Proportional to 221,978 and 479,428

Step by Step Solution

1. Step 1: Write the proportion equation
   221,978 : 479,428 = 479,428 : x
2. Step 2: Convert to fraction form
   221,978/479,428 = 479,428/x
3. Step 3: Cross multiply
   221,978x = 479,428 × 479,428
4. Step 4: Simplify right side
   221,978x = 229,851,207,184
5. Step 5: Solve for x
   x = 229,851,207,184/221,978
6. Step 6: Final answer
   x = 1,035,468.41