Finding the Fourth Proportional to 11,389.10, 17,091.50 and 3,993.62

Step by Step Solution

1. Step 1: Write the proportion equation
   11,389.10 : 17,091.50 = 3,993.62 : x
2. Step 2: Convert to fraction form
   11,389.10/17,091.50 = 3,993.62/x
3. Step 3: Cross multiply
   11,389.10x = 17,091.50 × 3,993.62
4. Step 4: Simplify right side
   11,389.10x = 68,256,850.80
5. Step 5: Solve for x
   x = 68,256,850.80/11,389.10
6. Step 6: Final answer
   x = 5,993.18