Finding the Fourth Proportional to 22,863.78, 31,537.89 and 15,690.42

Step by Step Solution

1. Step 1: Write the proportion equation
   22,863.78 : 31,537.89 = 15,690.42 : x
2. Step 2: Convert to fraction form
   22,863.78/31,537.89 = 15,690.42/x
3. Step 3: Cross multiply
   22,863.78x = 31,537.89 × 15,690.42
4. Step 4: Simplify right side
   22,863.78x = 494,842,740.01
5. Step 5: Solve for x
   x = 494,842,740.01/22,863.78
6. Step 6: Final answer
   x = 21,643.09