Finding the Fourth Proportional to 31,287.15, 43,176.33 and 17,139.96

Step by Step Solution

1. Step 1: Write the proportion equation
   31,287.15 : 43,176.33 = 17,139.96 : x
2. Step 2: Convert to fraction form
   31,287.15/43,176.33 = 17,139.96/x
3. Step 3: Cross multiply
   31,287.15x = 43,176.33 × 17,139.96
4. Step 4: Simplify right side
   31,287.15x = 740,040,569.15
5. Step 5: Solve for x
   x = 740,040,569.15/31,287.15
6. Step 6: Final answer
   x = 23,653.18