Finding the Third Proportional to 220,560 and 478,456

Step by Step Solution

1. Step 1: Write the proportion equation
   220,560 : 478,456 = 478,456 : x
2. Step 2: Convert to fraction form
   220,560/478,456 = 478,456/x
3. Step 3: Cross multiply
   220,560x = 478,456 × 478,456
4. Step 4: Simplify right side
   220,560x = 228,920,143,936
5. Step 5: Solve for x
   x = 228,920,143,936/220,560
6. Step 6: Final answer
   x = 1,037,904.17