Finding the Third Proportional to 128,426.50 and 170,408.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,426.50 : 170,408.50 = 170,408.50 : x
2. Step 2: Convert to fraction form
   128,426.50/170,408.50 = 170,408.50/x
3. Step 3: Cross multiply
   128,426.50x = 170,408.50 × 170,408.50
4. Step 4: Simplify right side
   128,426.50x = 29,039,056,872.25
5. Step 5: Solve for x
   x = 29,039,056,872.25/128,426.50
6. Step 6: Final answer
   x = 226,114.21