Finding the Fourth Proportional to 8,291.69, 12,429.72 and 4,127.76

Step by Step Solution

1. Step 1: Write the proportion equation
   8,291.69 : 12,429.72 = 4,127.76 : x
2. Step 2: Convert to fraction form
   8,291.69/12,429.72 = 4,127.76/x
3. Step 3: Cross multiply
   8,291.69x = 12,429.72 × 4,127.76
4. Step 4: Simplify right side
   8,291.69x = 51,306,901.03
5. Step 5: Solve for x
   x = 51,306,901.03/8,291.69
6. Step 6: Final answer
   x = 6,187.75