Finding the Third Proportional to 128,423.50 and 170,404.25

Step by Step Solution

1. Step 1: Write the proportion equation
   128,423.50 : 170,404.25 = 170,404.25 : x
2. Step 2: Convert to fraction form
   128,423.50/170,404.25 = 170,404.25/x
3. Step 3: Cross multiply
   128,423.50x = 170,404.25 × 170,404.25
4. Step 4: Simplify right side
   128,423.50x = 29,037,608,418.06
5. Step 5: Solve for x
   x = 29,037,608,418.06/128,423.50
6. Step 6: Final answer
   x = 226,108.22