Finding the Fourth Proportional to 11,436.46, 17,166.94 and 10,128.31

Step by Step Solution

1. Step 1: Write the proportion equation
   11,436.46 : 17,166.94 = 10,128.31 : x
2. Step 2: Convert to fraction form
   11,436.46/17,166.94 = 10,128.31/x
3. Step 3: Cross multiply
   11,436.46x = 17,166.94 × 10,128.31
4. Step 4: Simplify right side
   11,436.46x = 173,872,021.83
5. Step 5: Solve for x
   x = 173,872,021.83/11,436.46
6. Step 6: Final answer
   x = 15,203.31