Finding the Fourth Proportional to 8,128.16, 12,189.72 and 3,196.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.16 : 12,189.72 = 3,196.46 : x
2. Step 2: Convert to fraction form
   8,128.16/12,189.72 = 3,196.46/x
3. Step 3: Cross multiply
   8,128.16x = 12,189.72 × 3,196.46
4. Step 4: Simplify right side
   8,128.16x = 38,963,952.39
5. Step 5: Solve for x
   x = 38,963,952.39/8,128.16
6. Step 6: Final answer
   x = 4,793.70