Finding the Fourth Proportional to 8,129.61, 12,196.56 and 3,449.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,129.61 : 12,196.56 = 3,449.79 : x
2. Step 2: Convert to fraction form
   8,129.61/12,196.56 = 3,449.79/x
3. Step 3: Cross multiply
   8,129.61x = 12,196.56 × 3,449.79
4. Step 4: Simplify right side
   8,129.61x = 42,075,570.72
5. Step 5: Solve for x
   x = 42,075,570.72/8,129.61
6. Step 6: Final answer
   x = 5,175.60