Finding the Fourth Proportional to 8,128.30, 12,190.02 and 3,448.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.30 : 12,190.02 = 3,448.21 : x
2. Step 2: Convert to fraction form
   8,128.30/12,190.02 = 3,448.21/x
3. Step 3: Cross multiply
   8,128.30x = 12,190.02 × 3,448.21
4. Step 4: Simplify right side
   8,128.30x = 42,033,748.86
5. Step 5: Solve for x
   x = 42,033,748.86/8,128.30
6. Step 6: Final answer
   x = 5,171.28