Finding the Fourth Proportional to 11,891.91, 17,838.86 and 3,994.05

Step by Step Solution

1. Step 1: Write the proportion equation
   11,891.91 : 17,838.86 = 3,994.05 : x
2. Step 2: Convert to fraction form
   11,891.91/17,838.86 = 3,994.05/x
3. Step 3: Cross multiply
   11,891.91x = 17,838.86 × 3,994.05
4. Step 4: Simplify right side
   11,891.91x = 71,249,278.81
5. Step 5: Solve for x
   x = 71,249,278.81/11,891.91
6. Step 6: Final answer
   x = 5,991.41