Finding the Third Proportional to 219,330 and 478,320

Step by Step Solution

1. Step 1: Write the proportion equation
   219,330 : 478,320 = 478,320 : x
2. Step 2: Convert to fraction form
   219,330/478,320 = 478,320/x
3. Step 3: Cross multiply
   219,330x = 478,320 × 478,320
4. Step 4: Simplify right side
   219,330x = 228,790,022,400
5. Step 5: Solve for x
   x = 228,790,022,400/219,330
6. Step 6: Final answer
   x = 1,043,131.46