Finding the Third Proportional to 4,375.69 and 8,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   4,375.69 : 8,128.69 = 8,128.69 : x
2. Step 2: Convert to fraction form
   4,375.69/8,128.69 = 8,128.69/x
3. Step 3: Cross multiply
   4,375.69x = 8,128.69 × 8,128.69
4. Step 4: Simplify right side
   4,375.69x = 66,075,560.47
5. Step 5: Solve for x
   x = 66,075,560.47/4,375.69
6. Step 6: Final answer
   x = 15,100.61