Finding the Third Proportional to 2,128.15 and 3,176.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.15 : 3,176.09 = 3,176.09 : x
2. Step 2: Convert to fraction form
   2,128.15/3,176.09 = 3,176.09/x
3. Step 3: Cross multiply
   2,128.15x = 3,176.09 × 3,176.09
4. Step 4: Simplify right side
   2,128.15x = 10,087,521.88
5. Step 5: Solve for x
   x = 10,087,521.88/2,128.15
6. Step 6: Final answer
   x = 4,740.05