Finding the Third Proportional to 217,626 and 478,020

Step by Step Solution

1. Step 1: Write the proportion equation
   217,626 : 478,020 = 478,020 : x
2. Step 2: Convert to fraction form
   217,626/478,020 = 478,020/x
3. Step 3: Cross multiply
   217,626x = 478,020 × 478,020
4. Step 4: Simplify right side
   217,626x = 228,503,120,400
5. Step 5: Solve for x
   x = 228,503,120,400/217,626
6. Step 6: Final answer
   x = 1,049,980.79