Finding the Fourth Proportional to 8,128.92, 12,190.98 and 3,448.87

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.92 : 12,190.98 = 3,448.87 : x
2. Step 2: Convert to fraction form
   8,128.92/12,190.98 = 3,448.87/x
3. Step 3: Cross multiply
   8,128.92x = 12,190.98 × 3,448.87
4. Step 4: Simplify right side
   8,128.92x = 42,045,087.95
5. Step 5: Solve for x
   x = 42,045,087.95/8,128.92
6. Step 6: Final answer
   x = 5,172.28