Finding the Fourth Proportional to 8,429.05, 12,636.71 and 3,161.10

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.05 : 12,636.71 = 3,161.10 : x
2. Step 2: Convert to fraction form
   8,429.05/12,636.71 = 3,161.10/x
3. Step 3: Cross multiply
   8,429.05x = 12,636.71 × 3,161.10
4. Step 4: Simplify right side
   8,429.05x = 39,945,888.18
5. Step 5: Solve for x
   x = 39,945,888.18/8,429.05
6. Step 6: Final answer
   x = 4,739.08