Finding the Third Proportional to 128,908.50 and 276,858

Step by Step Solution

1. Step 1: Write the proportion equation
   128,908.50 : 276,858 = 276,858 : x
2. Step 2: Convert to fraction form
   128,908.50/276,858 = 276,858/x
3. Step 3: Cross multiply
   128,908.50x = 276,858 × 276,858
4. Step 4: Simplify right side
   128,908.50x = 76,650,352,164
5. Step 5: Solve for x
   x = 76,650,352,164/128,908.50
6. Step 6: Final answer
   x = 594,610.54