Finding the Fourth Proportional to 4,991.69, 6,891.74 and 3,105.83

Step by Step Solution

1. Step 1: Write the proportion equation
   4,991.69 : 6,891.74 = 3,105.83 : x
2. Step 2: Convert to fraction form
   4,991.69/6,891.74 = 3,105.83/x
3. Step 3: Cross multiply
   4,991.69x = 6,891.74 × 3,105.83
4. Step 4: Simplify right side
   4,991.69x = 21,404,522.86
5. Step 5: Solve for x
   x = 21,404,522.86/4,991.69
6. Step 6: Final answer
   x = 4,288.04