Finding the Fourth Proportional to 11,811.15, 17,716.89 and 3,491.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,811.15 : 17,716.89 = 3,491.31 : x
2. Step 2: Convert to fraction form
   11,811.15/17,716.89 = 3,491.31/x
3. Step 3: Cross multiply
   11,811.15x = 17,716.89 × 3,491.31
4. Step 4: Simplify right side
   11,811.15x = 61,855,155.23
5. Step 5: Solve for x
   x = 61,855,155.23/11,811.15
6. Step 6: Final answer
   x = 5,237.01