Finding the Fourth Proportional to 31,578.72, 43,578.62 and 17,431.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,578.72 : 43,578.62 = 17,431.56 : x
2. Step 2: Convert to fraction form
   31,578.72/43,578.62 = 17,431.56/x
3. Step 3: Cross multiply
   31,578.72x = 43,578.62 × 17,431.56
4. Step 4: Simplify right side
   31,578.72x = 759,643,329.25
5. Step 5: Solve for x
   x = 759,643,329.25/31,578.72
6. Step 6: Final answer
   x = 24,055.55