Finding the Fourth Proportional to 22,578.18, 31,158.21 and 13,017.89

Step by Step Solution

1. Step 1: Write the proportion equation
   22,578.18 : 31,158.21 = 13,017.89 : x
2. Step 2: Convert to fraction form
   22,578.18/31,158.21 = 13,017.89/x
3. Step 3: Cross multiply
   22,578.18x = 31,158.21 × 13,017.89
4. Step 4: Simplify right side
   22,578.18x = 405,613,994.59
5. Step 5: Solve for x
   x = 405,613,994.59/22,578.18
6. Step 6: Final answer
   x = 17,964.87