Finding the Third Proportional to 128,557 and 276,870

Step by Step Solution

1. Step 1: Write the proportion equation
   128,557 : 276,870 = 276,870 : x
2. Step 2: Convert to fraction form
   128,557/276,870 = 276,870/x
3. Step 3: Cross multiply
   128,557x = 276,870 × 276,870
4. Step 4: Simplify right side
   128,557x = 76,656,996,900
5. Step 5: Solve for x
   x = 76,656,996,900/128,557
6. Step 6: Final answer
   x = 596,288.00