Finding the Fourth Proportional to 22,815.12, 31,481.52 and 12,742.32

Step by Step Solution

1. Step 1: Write the proportion equation
   22,815.12 : 31,481.52 = 12,742.32 : x
2. Step 2: Convert to fraction form
   22,815.12/31,481.52 = 12,742.32/x
3. Step 3: Cross multiply
   22,815.12x = 31,481.52 × 12,742.32
4. Step 4: Simplify right side
   22,815.12x = 401,147,601.93
5. Step 5: Solve for x
   x = 401,147,601.93/22,815.12
6. Step 6: Final answer
   x = 17,582.53