Finding the Third Proportional to 128,849 and 204,985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,849 : 204,985.50 = 204,985.50 : x
2. Step 2: Convert to fraction form
   128,849/204,985.50 = 204,985.50/x
3. Step 3: Cross multiply
   128,849x = 204,985.50 × 204,985.50
4. Step 4: Simplify right side
   128,849x = 42,019,055,210.25
5. Step 5: Solve for x
   x = 42,019,055,210.25/128,849
6. Step 6: Final answer
   x = 326,110.84