Finding the Third Proportional to 128,447 and 204,561.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,447 : 204,561.50 = 204,561.50 : x
2. Step 2: Convert to fraction form
   128,447/204,561.50 = 204,561.50/x
3. Step 3: Cross multiply
   128,447x = 204,561.50 × 204,561.50
4. Step 4: Simplify right side
   128,447x = 41,845,407,282.25
5. Step 5: Solve for x
   x = 41,845,407,282.25/128,447
6. Step 6: Final answer
   x = 325,779.56