Finding the Third Proportional to 426,900 and 641,484

Step by Step Solution

1. Step 1: Write the proportion equation
   426,900 : 641,484 = 641,484 : x
2. Step 2: Convert to fraction form
   426,900/641,484 = 641,484/x
3. Step 3: Cross multiply
   426,900x = 641,484 × 641,484
4. Step 4: Simplify right side
   426,900x = 411,501,722,256
5. Step 5: Solve for x
   x = 411,501,722,256/426,900
6. Step 6: Final answer
   x = 963,930.01