Finding the Fourth Proportional to 8,128.68, 12,196.70 and 3,449.96

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.68 : 12,196.70 = 3,449.96 : x
2. Step 2: Convert to fraction form
   8,128.68/12,196.70 = 3,449.96/x
3. Step 3: Cross multiply
   8,128.68x = 12,196.70 × 3,449.96
4. Step 4: Simplify right side
   8,128.68x = 42,078,127.13
5. Step 5: Solve for x
   x = 42,078,127.13/8,128.68
6. Step 6: Final answer
   x = 5,176.50