Finding the Third Proportional to 128,487 and 204,610.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,487 : 204,610.50 = 204,610.50 : x
2. Step 2: Convert to fraction form
   128,487/204,610.50 = 204,610.50/x
3. Step 3: Cross multiply
   128,487x = 204,610.50 × 204,610.50
4. Step 4: Simplify right side
   128,487x = 41,865,456,710.25
5. Step 5: Solve for x
   x = 41,865,456,710.25/128,487
6. Step 6: Final answer
   x = 325,834.18