Finding the Fourth Proportional to 8,128.50, 12,194.37 and 3,511.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.50 : 12,194.37 = 3,511.50 : x
2. Step 2: Convert to fraction form
   8,128.50/12,194.37 = 3,511.50/x
3. Step 3: Cross multiply
   8,128.50x = 12,194.37 × 3,511.50
4. Step 4: Simplify right side
   8,128.50x = 42,820,530.26
5. Step 5: Solve for x
   x = 42,820,530.26/8,128.50
6. Step 6: Final answer
   x = 5,267.95