Finding the Fourth Proportional to 8,128.69, 12,187.56 and 3,743.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.69 : 12,187.56 = 3,743.75 : x
2. Step 2: Convert to fraction form
   8,128.69/12,187.56 = 3,743.75/x
3. Step 3: Cross multiply
   8,128.69x = 12,187.56 × 3,743.75
4. Step 4: Simplify right side
   8,128.69x = 45,627,222.26
5. Step 5: Solve for x
   x = 45,627,222.26/8,128.69
6. Step 6: Final answer
   x = 5,613.11