Finding the Third Proportional to 128,419 and 170,443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,419 : 170,443.50 = 170,443.50 : x
2. Step 2: Convert to fraction form
   128,419/170,443.50 = 170,443.50/x
3. Step 3: Cross multiply
   128,419x = 170,443.50 × 170,443.50
4. Step 4: Simplify right side
   128,419x = 29,050,986,692.25
5. Step 5: Solve for x
   x = 29,050,986,692.25/128,419
6. Step 6: Final answer
   x = 226,220.32