Finding the Third Proportional to 128,758.50 and 173,265

Step by Step Solution

1. Step 1: Write the proportion equation
   128,758.50 : 173,265 = 173,265 : x
2. Step 2: Convert to fraction form
   128,758.50/173,265 = 173,265/x
3. Step 3: Cross multiply
   128,758.50x = 173,265 × 173,265
4. Step 4: Simplify right side
   128,758.50x = 30,020,760,225
5. Step 5: Solve for x
   x = 30,020,760,225/128,758.50
6. Step 6: Final answer
   x = 233,155.56