Finding the Fourth Proportional to 8,613.63, 12,920.49 and 3,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,613.63 : 12,920.49 = 3,419.50 : x
2. Step 2: Convert to fraction form
   8,613.63/12,920.49 = 3,419.50/x
3. Step 3: Cross multiply
   8,613.63x = 12,920.49 × 3,419.50
4. Step 4: Simplify right side
   8,613.63x = 44,181,615.56
5. Step 5: Solve for x
   x = 44,181,615.56/8,613.63
6. Step 6: Final answer
   x = 5,129.27