Finding the Fourth Proportional to 11,389.41, 17,072.78 and 7,919.37

Step by Step Solution

1. Step 1: Write the proportion equation
   11,389.41 : 17,072.78 = 7,919.37 : x
2. Step 2: Convert to fraction form
   11,389.41/17,072.78 = 7,919.37/x
3. Step 3: Cross multiply
   11,389.41x = 17,072.78 × 7,919.37
4. Step 4: Simplify right side
   11,389.41x = 135,205,622.15
5. Step 5: Solve for x
   x = 135,205,622.15/11,389.41
6. Step 6: Final answer
   x = 11,871.17