Finding the Third Proportional to 128,595 and 200,254.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,595 : 200,254.50 = 200,254.50 : x
2. Step 2: Convert to fraction form
   128,595/200,254.50 = 200,254.50/x
3. Step 3: Cross multiply
   128,595x = 200,254.50 × 200,254.50
4. Step 4: Simplify right side
   128,595x = 40,101,864,770.25
5. Step 5: Solve for x
   x = 40,101,864,770.25/128,595
6. Step 6: Final answer
   x = 311,846.22