Finding the Third Proportional to 4,128.38 and 8,400.38

Step by Step Solution

1. Step 1: Write the proportion equation
   4,128.38 : 8,400.38 = 8,400.38 : x
2. Step 2: Convert to fraction form
   4,128.38/8,400.38 = 8,400.38/x
3. Step 3: Cross multiply
   4,128.38x = 8,400.38 × 8,400.38
4. Step 4: Simplify right side
   4,128.38x = 70,566,300.14
5. Step 5: Solve for x
   x = 70,566,300.14/4,128.38
6. Step 6: Final answer
   x = 17,093.00