Finding the Fourth Proportional to 10,042.05, 13,859.31 and 7,168.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,042.05 : 13,859.31 = 7,168.57 : x
2. Step 2: Convert to fraction form
   10,042.05/13,859.31 = 7,168.57/x
3. Step 3: Cross multiply
   10,042.05x = 13,859.31 × 7,168.57
4. Step 4: Simplify right side
   10,042.05x = 99,351,433.89
5. Step 5: Solve for x
   x = 99,351,433.89/10,042.05
6. Step 6: Final answer
   x = 9,893.54