Finding the Fourth Proportional to 22,570.89, 31,137.99 and 13,613.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,570.89 : 31,137.99 = 13,613.42 : x
2. Step 2: Convert to fraction form
   22,570.89/31,137.99 = 13,613.42/x
3. Step 3: Cross multiply
   22,570.89x = 31,137.99 × 13,613.42
4. Step 4: Simplify right side
   22,570.89x = 423,894,380.14
5. Step 5: Solve for x
   x = 423,894,380.14/22,570.89
6. Step 6: Final answer
   x = 18,780.58