Finding the Third Proportional to 220,819.50 and 478,980

Step by Step Solution

1. Step 1: Write the proportion equation
   220,819.50 : 478,980 = 478,980 : x
2. Step 2: Convert to fraction form
   220,819.50/478,980 = 478,980/x
3. Step 3: Cross multiply
   220,819.50x = 478,980 × 478,980
4. Step 4: Simplify right side
   220,819.50x = 229,421,840,400
5. Step 5: Solve for x
   x = 229,421,840,400/220,819.50
6. Step 6: Final answer
   x = 1,038,956.43