Finding the Third Proportional to 217,620 and 478,008

Step by Step Solution

1. Step 1: Write the proportion equation
   217,620 : 478,008 = 478,008 : x
2. Step 2: Convert to fraction form
   217,620/478,008 = 478,008/x
3. Step 3: Cross multiply
   217,620x = 478,008 × 478,008
4. Step 4: Simplify right side
   217,620x = 228,491,648,064
5. Step 5: Solve for x
   x = 228,491,648,064/217,620
6. Step 6: Final answer
   x = 1,049,957.03