Finding the Third Proportional to 218,958 and 478,812

Step by Step Solution

1. Step 1: Write the proportion equation
   218,958 : 478,812 = 478,812 : x
2. Step 2: Convert to fraction form
   218,958/478,812 = 478,812/x
3. Step 3: Cross multiply
   218,958x = 478,812 × 478,812
4. Step 4: Simplify right side
   218,958x = 229,260,931,344
5. Step 5: Solve for x
   x = 229,260,931,344/218,958
6. Step 6: Final answer
   x = 1,047,054.37