Finding the Fourth Proportional to 11,790.96, 17,687.69 and 3,891.17

Step by Step Solution

1. Step 1: Write the proportion equation
   11,790.96 : 17,687.69 = 3,891.17 : x
2. Step 2: Convert to fraction form
   11,790.96/17,687.69 = 3,891.17/x
3. Step 3: Cross multiply
   11,790.96x = 17,687.69 × 3,891.17
4. Step 4: Simplify right side
   11,790.96x = 68,825,700.80
5. Step 5: Solve for x
   x = 68,825,700.80/11,790.96
6. Step 6: Final answer
   x = 5,837.16