Finding the Third Proportional to 120,631 and 254,870

Step by Step Solution

1. Step 1: Write the proportion equation
   120,631 : 254,870 = 254,870 : x
2. Step 2: Convert to fraction form
   120,631/254,870 = 254,870/x
3. Step 3: Cross multiply
   120,631x = 254,870 × 254,870
4. Step 4: Simplify right side
   120,631x = 64,958,716,900
5. Step 5: Solve for x
   x = 64,958,716,900/120,631
6. Step 6: Final answer
   x = 538,491.08