Finding the Third Proportional to 219,220 and 478,156

Step by Step Solution

1. Step 1: Write the proportion equation
   219,220 : 478,156 = 478,156 : x
2. Step 2: Convert to fraction form
   219,220/478,156 = 478,156/x
3. Step 3: Cross multiply
   219,220x = 478,156 × 478,156
4. Step 4: Simplify right side
   219,220x = 228,633,160,336
5. Step 5: Solve for x
   x = 228,633,160,336/219,220
6. Step 6: Final answer
   x = 1,042,939.33