Finding the Fourth Proportional to 11,893.89, 17,868.18 and 8,391.97

Step by Step Solution

1. Step 1: Write the proportion equation
   11,893.89 : 17,868.18 = 8,391.97 : x
2. Step 2: Convert to fraction form
   11,893.89/17,868.18 = 8,391.97/x
3. Step 3: Cross multiply
   11,893.89x = 17,868.18 × 8,391.97
4. Step 4: Simplify right side
   11,893.89x = 149,949,141.17
5. Step 5: Solve for x
   x = 149,949,141.17/11,893.89
6. Step 6: Final answer
   x = 12,607.24