Finding the Third Proportional to 219,912 and 480,144

Step by Step Solution

1. Step 1: Write the proportion equation
   219,912 : 480,144 = 480,144 : x
2. Step 2: Convert to fraction form
   219,912/480,144 = 480,144/x
3. Step 3: Cross multiply
   219,912x = 480,144 × 480,144
4. Step 4: Simplify right side
   219,912x = 230,538,260,736
5. Step 5: Solve for x
   x = 230,538,260,736/219,912
6. Step 6: Final answer
   x = 1,048,320.51